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/pull_request.yml

@@ -8,7 +8,7 @@
   base_repo_id: 1
   head_branch: branch1
   base_branch: master
-  merge_base: 1234567890abcdef
+  merge_base: 4a357436d925b5c974181ff12a994538ddc5a269
   has_merged: true
   merger_id: 2
 
@@ -22,7 +22,7 @@
   base_repo_id: 1
   head_branch: branch2
   base_branch: master
-  merge_base: fedcba9876543210
+  merge_base: 4a357436d925b5c974181ff12a994538ddc5a269
   has_merged: false
 
 -