API: Add pull review endpoints (#11224)

* API: Added pull review read only endpoints

* Update Structs, move Conversion, Refactor

* refactor

* lint & co

* fix lint + refactor

* add new Review state, rm unessesary, refacotr loadAttributes, convert patch to diff

* add DeletePullReview

* add paggination

* draft1: Create & submit review

* fix lint

* fix lint

* impruve test

* DONT use GhostUser for loadReviewer

* expose comments_count of a PullReview

* infent GetCodeCommentsCount()

* fixes

* fix+impruve

* some nits

* Handle Ghosts 👻

* add TEST for GET apis

* complete TESTS

* add HTMLURL to PullReview responce

* code format as per @lafriks

* update swagger definition

* Update routers/api/v1/repo/pull_review.go

Co-authored-by: David Svantesson <davidsvantesson@gmail.com>

* add comments

Co-authored-by: Thomas Berger <loki@lokis-chaos.de>
Co-authored-by: David Svantesson <davidsvantesson@gmail.com>

models/fixtures/review.yml

@@ -60,6 +60,8 @@
   reviewer_id: 4
   issue_id: 3
   content: "New review 5"
+  commit_id: 8091a55037cd59e47293aca02981b5a67076b364
+  stale: true
   updated_unix: 946684813
   created_unix: 946684813
 -
@@ -77,5 +79,6 @@
   reviewer_id: 100
   issue_id: 3
   content: "a deleted user's review"
+  official: true
   updated_unix: 946684815
-  created_unix: 946684815
+  created_unix: 946684815