API: Expose its limitation settings

[6543]

close #12664

[mrsdizzie]

All of the new settings API should get tests at some point : )

[6543]

Lable kind/api needed and milestone

[codecov-commenter]

Codecov Report

Merging #12714 into master will decrease coverage by 0.00%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master   #12714      +/-   ##
==========================================
- Coverage   43.31%   43.31%   -0.01%     
==========================================
  Files         646      646              
  Lines       71616    71624       +8     
==========================================
+ Hits        31022    31025       +3     
- Misses      35577    35580       +3     
- Partials     5017     5019       +2     

Impacted Files	Coverage Δ
routers/api/v1/settings/settings.go	25.00% <0.00%> (-19.45%)	⬇️
routers/api/v1/api.go	79.04% <100.00%> (+0.03%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-4.50%)	⬇️
modules/notification/mail/mail.go	34.48% <0.00%> (-3.45%)	⬇️
modules/notification/ui/ui.go	80.55% <0.00%> (-2.78%)	⬇️
models/notification.go	66.13% <0.00%> (-0.92%)	⬇️
models/error.go	35.32% <0.00%> (-0.35%)	⬇️
models/issue_comment.go	53.90% <0.00%> (+0.15%)	⬆️
services/pull/pull.go	42.03% <0.00%> (+0.46%)	⬆️
... and 6 more

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[techknowlogick]

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