cmd: charon alpha test skeleton

[KaloyanTanev]

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

[codecov]

Codecov Report

Attention: Patch coverage is 81.21622% with 139 lines in your changes are missing coverage. Please review.

Project coverage is 54.77%. Comparing base (b7ece61) to head (d754a7d).
Report is 2 commits behind head on main.

Files	Patch %	Lines
cmd/test.go	66.92%	36 Missing and 6 partials ⚠️
cmd/ascii.go	57.14%	27 Missing ⚠️
cmd/testpeers.go	88.74%	23 Missing and 3 partials ⚠️
cmd/testbeacon.go	89.11%	12 Missing and 4 partials ⚠️
cmd/testvalidator.go	87.50%	12 Missing and 4 partials ⚠️
cmd/duration.go	82.05%	6 Missing and 1 partial ⚠️
cmd/cmd.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3008      +/-   ##
==========================================
+ Coverage   54.02%   54.77%   +0.74%     
==========================================
  Files         200      206       +6     
  Lines       28097    28837     +740     
==========================================
+ Hits        15180    15796     +616     
- Misses      11114    11223     +109     
- Partials     1803     1818      +15     

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[pinebit]

Provided my comments

[sonarcloud]

Quality Gate passed

Issues
10 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
11.9% Duplication on New Code

See analysis details on SonarCloud