refactor(api): move repo logic to separate package

[jbrockopp]

Based off of #615

This change continues the refactor efforts initially introduced in the above PR.

This adds a new repo package to the github.com/go-vela/server/api package.

This contains all the same handlers that existed previously but with each of them within their own file.

Also, this change skips checking a user's access for orgs, repos, and teams if that resource is in their personal org.

i.e. Vela no longer check's my access level for those resources when interacting with https://github.com/jbrockopp

This will help improve the user experience when developing locally and reduce unneeded calls to the SCM.

[codecov]

Codecov Report

Merging #754 (97b5842) into main (96b5d86) will increase coverage by 2.02%.
The diff coverage is 38.63%.

❗ Current head 97b5842 differs from pull request most recent head 7f427d0. Consider uploading reports for the commit 7f427d0 to get more accurate results

@@            Coverage Diff             @@
##             main     #754      +/-   ##
==========================================
+ Coverage   54.87%   56.89%   +2.02%     
==========================================
  Files         244      243       -1     
  Lines       16506    15939     -567     
==========================================
+ Hits         9058     9069      +11     
+ Misses       7048     6468     -580     
- Partials      400      402       +2     

Impacted Files	Coverage Δ
router/middleware/perm/perm.go	60.80% <10.00%> (-1.41%)	⬇️
scm/github/access.go	82.17% <33.33%> (-13.12%)	⬇️
scm/github/repo.go	75.00% <100.00%> (+0.44%)	⬆️

[cognifloyd]

One minor nit, but looks good to me anyway. It's nice to see all of this moving into separate modules with shorter files. So much nicer.

[ecrupper]

A couple questions out of curiosity, but otherwise LGTM — I like the refactor

[jbrockopp]

@cognifloyd @ecrupper ready for review again 👍