* add "before" query to ListIssueComments and ListRepoIssueComments

* Add TEST

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

* add GET /repos/{owner}/{repo}/issues/comments/{id}
 and complete error list for swagger in other func

* add repo check

* Fix data race in testlogger

* Update git_helper_for_declarative_test.go

* move sdk structs to moduels/structs

* fix tests

* fix fmt

* fix swagger

* fix vendor

* Helper functions for intergration test boilerplate

Set request headers in helper functions, and new helper for requests with string-formatted URLs