Add issue subscription check to API

[6543]

close #10962

GET ​/repos​/{owner}​/{repo}​/issues​/{index}​/subscriptions​/check

-> return a WatchInfo

Info

• added smal refactor c7ad54c witch isn't worth its own pr

ToDo

• add check via api
• write test

[codecov-io]

Codecov Report

Merging #10967 into master will increase coverage by 0.10%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master   #10967      +/-   ##
==========================================
+ Coverage   43.44%   43.55%   +0.10%     
==========================================
  Files         600      600              
  Lines       85108    85172      +64     
==========================================
+ Hits        36978    37094     +116     
+ Misses      43562    43500      -62     
- Partials     4568     4578      +10     

Impacted Files	Coverage Δ
routers/api/v1/user/watch.go	0.00% <0.00%> (ø)
models/issue.go	51.40% <33.33%> (-0.09%)	⬇️
models/issue_watch.go	69.73% <53.84%> (-3.28%)	⬇️
routers/api/v1/repo/issue_subscription.go	56.42% <78.84%> (+56.42%)	⬆️
routers/repo/issue.go	35.32% <80.00%> (-0.25%)	⬇️
routers/api/v1/api.go	76.53% <100.00%> (+0.03%)	⬆️
services/pull/patch.go	62.93% <0.00%> (-2.80%)	⬇️
services/pull/temp_repo.go	31.62% <0.00%> (-2.57%)	⬇️
services/pull/check.go	53.04% <0.00%> (-2.44%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.93%)	⬇️
... and 2 more

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[guillep2k]

Isn't this getting too intrusive for the users?

🤦‍♂ I see, it's for clients that use a different interface.

[6543]

It will help clients for gitea.

for example: https://gitea.com/gitnex/GitNex/pulls/203/files#issuecomment-110519

[6543]

@guillep2k -> 7c4f75d 🎉
it breaks somehow the api pattern but is eaven easy to use and can't leek data