ehance: use github app token to clone code instead of ssh key

[wwcchh0123]

1. main初始化token，存储 map[InstallAppID]token
2. event 从 map 中获取token ，token 若过期 则维护更新 map[InstallAppID]token
3. provider 拥有 getToken 能力
4. go mod tidy 下载私有仓库所需的鉴权设置在 golangci-lint 中完成，token 从provider中获取

[netlify[bot]]

✅ Deploy Preview for reviewbot-x canceled.

Name	Link
🔨 Latest commit	d055d80a7a29e9a88c5456bb5634eb51b3875bab
🔍 Latest deploy log	https://app.netlify.com/sites/reviewbot-x/deploys/6721a1caf763b5000807e489

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0.95238% with 208 lines in your changes missing coverage. Please review.

Project coverage is 28.90%. Comparing base (736cd57) to head (d055d80). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
server.go	0.00%	141 Missing :warning:
main.go	0.00%	39 Missing :warning:
internal/linters/go/golangci_lint/golangci_lint.go	0.00%	26 Missing :warning:
internal/linters/providergithub.go	50.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #417 +/- ## ========================================== - Coverage 30.34% 28.90% -1.44% ========================================== Files 29 29 Lines 3556 3733 +177 ========================================== Hits 1079 1079 - Misses 2345 2522 +177 Partials 132 132 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.