cmd: charon alpha test skeleton (#3008)

Add the skeleton framework for the charon alpha test command. Prepare all the necessities required to start building different test suites. Set the first 3 envisioned categories - peers, beacon node and validator client.

To try it out:
```
make charon
./charon alpha test peers --enrs="test" --output-toml="peers.toml" --timeout="3s"
./charon alpha test beacon --endpoints="test" --output-toml="beacon.toml" --timeout="3s"
./charon alpha test validator --output-toml="validator.toml" --timeout="3s"
```
From all the flags above, only `enrs` and `endpoints` are mandatory.

N.B.: Implementation of peers, beacon node and validator client tests are out of the scope of this PR.

~~Edit: Unit tests are not yet of this PR, keep in mind when reviewing~~

category: feature
ticket: #2995

.golangci.yml

@@ -147,6 +147,7 @@ linters:
     - gochecknoglobals
     - gocognit
     - gocyclo
+    - godot
     - godox
     - goerr113
     - golint

cmd/ascii.go

@@ -0,0 +1,80 @@
+// Copyright © 2022-2024 Obol Labs Inc. Licensed under the terms of a Business Source License 1.1
+
+package cmd
+
+func peersASCII() []string {
+	return []string{
+		"  ____                                                      ",
+		" |  __ \\                                                    ",
+		" | |__) |___   ___  _ __  ___                               ",
+		" |  ___// _ \\ / _ \\| '__|/ __|                              ",
+		" | |   |  __/|  __/| |   \\__ \\                              ",
+		" |_|    \\___| \\___||_|   |___/                              ",
+	}
+}
+
+func beaconASCII() []string {
+	return []string{
+		"  ____                                                      ",
+		" |  _ \\                                                     ",
+		" | |_) |  ___   __ _   ___  ___   _ __                      ",
+		" |  _ <  / _ \\ / _` | / __|/ _ \\ | '_ \\                     ",
+		" | |_) ||  __/| (_| || (__| (_) || | | |                    ",
+		" |____/  \\___| \\__,_| \\___|\\___/ |_| |_|                    ",
+	}
+}
+
+func validatorASCII() []string {
+	return []string{
+		" __      __     _  _      _         _                       ",
+		" \\ \\    / /    | |(_,    | |       | |                      ",
+		"  \\ \\  / /__ _ | | _   __| |  __ _ | |_  ___   _ __         ",
+		"   \\ \\/ // _` || || | / _` | / _` || __|/ _ \\ | '__|        ",
+		"    \\  /| (_| || || || (_| || (_| || |_| (_) || |           ",
+		"     \\/  \\__,_||_||_| \\__,_| \\__,_| \\__|\\___/ |_|           ",
+	}
+}
+
+func categoryDefaultASCII() []string {
+	return []string{
+		"                                                            ",
+		"                                                            ",
+		"                                                            ",
+		"                                                            ",
+		"                                                            ",
+		"                                                            ",
+	}
+}
+
+func scoreAASCII() []string {
+	return []string{
+		"          ",
+		"    /\\    ",
+		"   /  \\   ",
+		"  / /\\ \\  ",
+		" / ____ \\ ",
+		"/_/    \\_\\",
+	}
+}
+
+func scoreBASCII() []string {
+	return []string{
+		" ____     ",
+		"|  _ \\    ",
+		"| |_) |   ",
+		"|  _ <    ",
+		"| |_) |   ",
+		"|____/    ",
+	}
+}
+
+func scoreCASCII() []string {
+	return []string{
+		"   ____     ",
+		" / ____|   ",
+		"| |       ",
+		"| |       ",
+		"| |____   ",
+		" \\_____|  ",
+	}
+}

cmd/cmd.go

@@ -45,6 +45,11 @@ func New() *cobra.Command {
 		),
 		newCombineCmd(newCombineFunc),
 		newAlphaCmd(
+			newTestCmd(
+				newTestPeersCmd(runTestPeers),
+				newTestBeaconCmd(runTestBeacon),
+				newTestValidatorCmd(runTestValidator),
+			),
 			newAddValidatorsCmd(runAddValidatorsSolo),
 			newViewClusterManifestCmd(runViewClusterManifest),
 		),

cmd/duration.go

@@ -0,0 +1,67 @@
+// Copyright © 2022-2024 Obol Labs Inc. Licensed under the terms of a Business Source License 1.1
+
+package cmd
+
+import (
+	"encoding/json"
+	"strconv"
+	"time"
+
+	"github.com/obolnetwork/charon/app/errors"
+)
+
+type Duration struct {
+	time.Duration
+}
+
+func (d Duration) MarshalJSON() ([]byte, error) {
+	res, err := json.Marshal(d.String())
+	if err != nil {
+		return nil, errors.Wrap(err, "marshal json duration")
+	}
+
+	return res, nil
+}
+
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	var v any
+	err := json.Unmarshal(b, &v)
+	if err != nil {
+		return errors.Wrap(err, "unmarshal json duration")
+	}
+	switch value := v.(type) {
+	case float64:
+		d.Duration = time.Duration(value)
+	case string:
+		d.Duration, err = time.ParseDuration(value)
+		if err != nil {
+			return errors.Wrap(err, "parse string time to duration")
+		}
+	default:
+		return errors.New("invalid json duration")
+	}
+
+	return nil
+}
+
+func (d Duration) MarshalText() ([]byte, error) {
+	return []byte(d.String()), nil
+}
+
+func (d *Duration) UnmarshalText(b []byte) error {
+	strTime := string(b)
+	intTime, err := strconv.ParseInt(strTime, 10, 64)
+	switch {
+	case err == nil:
+		d.Duration = time.Duration(intTime)
+	case errors.Is(err, strconv.ErrSyntax):
+		d.Duration, err = time.ParseDuration(strTime)
+		if err != nil {
+			return errors.Wrap(err, "parse string time to duration")
+		}
+	default:
+		return errors.Wrap(err, "invalid text duration")
+	}
+
+	return nil
+}