Add trigger for user membership in a team

[gagoar]

Issue Reference: fixes #346

Implements feature request #346

Motivation and Context

Useful to create custom rules like adding a label when a member is part of a team, among other things, to trigger a workflow.

it is a really useful filter when adding ppl to a review or commenting, for instance, checking if the person is on a team, might reduce adding a comment to that PR. etc.

How Has This Been Tested?

unit tests.

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[codecov[bot]]

Codecov Report

Merging #374 (bef9140) into master (832e036) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #374   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         9    +1     
  Lines          344       373   +29     
  Branches        54        59    +5     
=========================================
+ Hits           344       373   +29     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/isMemberOf.ts	100.00% <100.00%> (ø)
src/rules.ts	100.00% <100.00%> (ø)

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication