feat(form): Support default values for collections in form binding

[takanuva15]

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This PR adds support for default values for the "multi" and "csv" collection_format binding types introduced in PR #3986.

• To circumvent the issue of parsing commas or needing to use regex, I set semicolon as the delimiter for "multi" and "csv"
• By merging this PR, we can also close PR add an option to have the default value as a list with commas as seperator #2744 from 2021 that was adding the same functionality to an older version of Gin

closes #2744

[takanuva15]

@appleboy this PR is related to the PR #3986 you merged last month

[takanuva15]

@appleboy updated the PR and fixed the issue with golangci-lint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.07%. Comparing base (3dc1cd6) to head (edba6c2).
Report is 72 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4048      +/-   ##
==========================================
- Coverage   99.21%   99.07%   -0.14%     
==========================================
  Files          42       44       +2     
  Lines        3182     2811     -371     
==========================================
- Hits         3157     2785     -372     
+ Misses         17       15       -2     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	99.06% <100.00%> (?)
-tags go_json	99.06% <100.00%> (?)
-tags nomsgpack	99.06% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	99.07% <100.00%> (-0.14%)	⬇️
go-1.22	99.07% <100.00%> (?)
macos-latest	99.07% <100.00%> (-0.14%)	⬇️
ubuntu-latest	99.07% <100.00%> (-0.14%)	⬇️

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[takanuva15]

@appleboy updated the PR to fix the test coverage issue

[takanuva15]

@appleboy I don't know how else to increase coverage since all of my code is 100% covered - the "codecov/patch" says codecov/patch — 100.00% of diff hit (target 99.21%)

I saw that you approved this other PR 2 weeks ago with worse project coverage than my PR, so it looks like my PR is actually making the overall coverage better than it was previously.

If there's no other issue, I hope you can approve it?