Create custom role APIs

[mohaldu]

resolves#2493

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[gmlewis]

Hi @mohaldu - please don't use force-push in this repo... we always squash-and-merge anyway, so it is not necessary. See CONTRIBUTING.md for more details.

[gmlewis]

Thank you, @mohaldu!
Just a few changes, please, then we should be ready for a second review before merging.

[mohaldu]

Hi @gmlewis thanks for the review, all changes made

[gmlewis]

@mohaldu - please run go generate ./... at the top of the repo then push the resulting changes.
See CONTRIBUTING.md for more details.

[gmlewis]

Thank you, @mohaldu !
LGTM.

Awaiting second LGTM+Approval from any other contributor to this repo before merging.

[codecov]

Codecov Report

Merging #2494 (621667b) into master (38d7b16) will decrease coverage by 0.02%.
The diff coverage is 92.30%.

@@ Coverage Diff @@## master #2494 +/- ##
==========================================
- Coverage 97.99% 97.97% -0.03% 
==========================================
Files 123 123 Lines 10774 10813 +39 ==========================================
+ Hits 10558 10594 +36 - Misses 148 150 +2 - Partials 68 69 +1 

Impacted Files	Coverage Δ
github/orgs_custom_roles.go	94.23% <92.30%> (-5.77%)	⬇️

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[valbeat]

@mohaldu LGTM!

[gmlewis]

Thank you, @valbeat !
Merging.