Add API for manipulating Git hooks

[segevfiner]

❗️ Depends on go-gitea/go-sdk#156 (merged)
❗️ Depends on go-gitea/git#151 (merged)
(Depgo.mod must be updated when those are merged as I made it point to our fork for this to build)

This adds API for manipulating Git hooks which are only accessible via a web form ATM.

[segevfiner]

Refreshed the PR with changes from master. The added replace directive in go.mod needs to be removed once the SDK PR is merged and the version of the SDK updated in the require directive.

[techknowlogick]

@segevfiner I've just merged the SDK code. You can now update this PR with appropriate changes :)

[techknowlogick]

This looks great! Thanks for PR 😄 Could you add some tests (ensure that githooks update after change, simple fetch of githooks return expected content, error when user who doesn't have access to githooks tries to access)?

[codecov-io]

Codecov Report

Merging #6436 into master will increase coverage by 0.2%.
The diff coverage is 80.89%.

@@            Coverage Diff            @@
##           master    #6436     +/-   ##
=========================================
+ Coverage   40.53%   40.74%   +0.2%     
=========================================
  Files         406      407      +1     
  Lines       54506    54680    +174     
=========================================
+ Hits        22095    22278    +183     
+ Misses      29373    29351     -22     
- Partials     3038     3051     +13

Impacted Files	Coverage Δ
routers/api/v1/convert/convert.go	81.31% <100%> (+0.63%)	⬆️
routers/api/v1/api.go	73.06% <100%> (+0.66%)	⬆️
modules/context/api.go	50.61% <50%> (ø)	⬆️
routers/api/v1/repo/git_hook.go	78.7% <78.7%> (ø)
modules/git/utils.go	84.44% <0%> (+6.66%)	⬆️
modules/git/hook.go	50.72% <0%> (+50.72%)	⬆️
modules/git/repo_hook.go	100% <0%> (+100%)	⬆️

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[segevfiner]

This looks great! Thanks for PR 😄 Could you add some tests (ensure that githooks update after change, simple fetch of githooks return expected content, error when user who doesn't have access to githooks tries to access)?

@techknowlogick I want to add a Git hook to one of the fixture repos to test list/get, but to which one of the fixture repos should I add it too? Maybe a new one?

[sapk]

Looking at recent PR you can re-use the same repo (or add another similar) introduce in #6479
The test part for example : https://github.com/go-gitea/gitea/pull/6479/files#diff-b3cdbf4d78c522550fce21298c72c321

[segevfiner]

I added a bunch of tests.

EDIT: Whooops, build failure, will fix soon.