feat: enhance transformer

[xdlbdy]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary

What is changed and how does it work?

• add transform function
• transformer define use in function and template format change from "${var}" to "<var>"

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

1. vsctl eventbus create --name xdl
2. create subscription

vsctl subscription create \
    --eventbus xdl \
    --sink 'http://localhost:18080' \
    --transformer '{
        "define": {
          "v1":"123",
          "v2":"456",
          "id":"$.id"
        },
        "pipeline":[
            {"command":["join","$.testtime","-","$.data.year","$.data.month","$.data.day"]},
            {"command":["math_add","$.data.math_add","<v1>","<v2>"]},
            {"command":["replace","$.data.id","<id>"]},
            {"command":["create","$.data.source","$.source"]},
            {"command":["delete","$.data.year"]},
            {"command":["delete","$.data.month"]},
            {"command":["delete","$.data.day"]}
        ]
      }'

3. put event

vsctl event put xdl \           
  --data '{"year":2022,"month":11,"day":16,"id":"id1"}' \
  --id "1nd" \
  --source "transformer"

4. sink receive event

specversion: 1.0
type: cmd
source: transformer
id: 1nd
time: 2022-11-16T07:32:21.9804Z
datacontenttype: application/json,
testtime: 2022-11-16
xvanuseventbus: xdl
xvanusstime: 2022-11-16T07:32:21.987Z\n
data:{
  "id": "1nd",
  "math_add": 579,
  "source": "transformer"
}

• No code

[codecov]

Codecov Report

Merging #305 (1faf2c6) into main (09f3748) will increase coverage by 0.14%.
The diff coverage is 73.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   62.72%   62.86%   +0.14%     
==========================================
  Files         133      143      +10     
  Lines       12128    12737     +609     
==========================================
+ Hits         7607     8007     +400     
- Misses       3977     4147     +170     
- Partials      544      583      +39     

Impacted Files	Coverage Δ
internal/controller/trigger/controller.go	38.78% <0.00%> (-0.33%)	⬇️
internal/store/io/file_linux.go	0.00% <0.00%> (ø)
internal/primitive/transform/arg/arg.go	41.17% <41.17%> (ø)
internal/primitive/transform/arg/event.go	50.68% <50.68%> (ø)
internal/trigger/transform/transformer.go	66.66% <65.38%> (-33.34%)	⬇️
...ernal/controller/trigger/validation/subscripton.go	70.24% <65.51%> (-0.65%)	⬇️
internal/trigger/util/event.go	58.39% <67.79%> (ø)
...nternal/primitive/transform/action/regex_action.go	71.11% <71.11%> (ø)
internal/primitive/transform/arg/define.go	75.00% <75.00%> (ø)
internal/primitive/transform/action/action.go	75.91% <75.91%> (ø)
... and 15 more

---

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[wenfengwang]

Could you add at least one benchmark test for different string/regex/struct/time/math functions?

[xdlbdy]

Could you add at least one benchmark test for different string/regex/struct/time/math functions?

goos: darwin
goarch: arm64
pkg: github.com/linkall-labs/vanus/internal/primitive/transform/action
BenchmarkAction
BenchmarkAction/delete
BenchmarkAction/delete-10 3875511 308.4 ns/op
BenchmarkAction/create
BenchmarkAction/create-10 1348846 889.0 ns/op
BenchmarkAction/replace
BenchmarkAction/replace-10 1889361 634.3 ns/op
BenchmarkAction/move
BenchmarkAction/move-10 670744 1634 ns/op
BenchmarkAction/rename
BenchmarkAction/rename-10 935678 1269 ns/op
BenchmarkAction/math_add
BenchmarkAction/math_add-10 1528915 799.0 ns/op
BenchmarkAction/math_sub
BenchmarkAction/math_sub-10 1506090 850.9 ns/op
BenchmarkAction/math_mul
BenchmarkAction/math_mul-10 1464643 765.0 ns/op
BenchmarkAction/math_div
BenchmarkAction/math_div-10 1580599 766.1 ns/op
BenchmarkAction/format_unix_time
BenchmarkAction/format_unix_time-10 942679 1256 ns/op
BenchmarkAction/format_date
BenchmarkAction/format_date-10 719745 1646 ns/op
BenchmarkAction/join
BenchmarkAction/join-10 1683962 717.5 ns/op
BenchmarkAction/upper_case
BenchmarkAction/upper_case-10 1815895 657.3 ns/op
BenchmarkAction/lower_case
BenchmarkAction/lower_case-10 1821562 657.7 ns/op
BenchmarkAction/add_prefix
BenchmarkAction/add_prefix-10 1773424 678.6 ns/op
BenchmarkAction/add_suffix
BenchmarkAction/add_suffix-10 1778683 695.2 ns/op
BenchmarkAction/replace_with_regex
BenchmarkAction/replace_with_regex-10 1271424 923.3 ns/op

[wenfengwang]

LGTM