feat(mr/view): show reviewers of the merge request

[kousikmitra]

Description
It enables mr view to show list of reviewers for a merge request

Related Issue

Delivers #692

How Has This Been Tested?
Added test case.

Locally tested with
glab mr view
glab mr view <id>
glab mr view <branch>

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)

[zemzale]

LGTM! NIce work @kousikmitra

[zemzale]

The test case for commands/mr/view TestMRView/no_tty failed @kousikmitra

That needs to be fixed before this can be merged

[kousikmitra]

can you approve the workflow please?

[codecov]

Codecov Report

Merging #693 (738b978) into trunk (35e792f) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            trunk     #693      +/-   ##
==========================================
+ Coverage   59.95%   60.00%   +0.04%     
==========================================
  Files          90       90              
  Lines        6450     6458       +8     
==========================================
+ Hits         3867     3875       +8     
  Misses       2218     2218              
  Partials      365      365              

Impacted Files	Coverage Δ
commands/mr/view/mr_view.go	76.82% <100.00%> (+1.29%)	⬆️

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[zemzale]

All green now 🎉 . Thank you for working on this @kousikmitra