Add logout command

[narayanpai1]

What does this PR do?

It adds the logout command. The command lists out all the alias available in the RC File located in the home directory and prompts the user to select an alias to delete.

Usage

newman logout

Screenshots

Testing

• The CLI and parser tests for the command are added.

[narayanpai1]

@codenirvana Since the only additional code being checked in library coverage tests is in bin/newman.js, I don't feel the coverage for test/library can be increased. Hence, I updated the coverage threshold.

[codecov]

Codecov Report

Merging #2401 into feature/login will increase coverage by 9.57%.
The diff coverage is 92.77%.

@@                Coverage Diff                @@
##           feature/login    #2401      +/-   ##
=================================================
+ Coverage          82.35%   91.93%   +9.57%     
=================================================
  Files                 23       24       +1     
  Lines               1281     1364      +83     
  Branches             360      377      +17     
=================================================
+ Hits                1055     1254     +199     
+ Misses               226      110     -116     

Flag	Coverage Δ
#cli	83.79% <92.77%> (?)
#integration	42.00% <21.42%> (-0.26%)	⬇️
#library	58.61% <21.42%> (-0.47%)	⬇️
#unit	75.21% <50.00%> (-0.28%)	⬇️

Impacted Files	Coverage Δ
lib/logout/index.js	91.30% <91.30%> (ø)
bin/newman.js	86.88% <100.00%> (+18.96%)	⬆️
lib/print/index.js	84.37% <100.00%> (+25.75%)	⬆️
lib/util.js	95.29% <0.00%> (+1.17%)	⬆️
bin/util.js	100.00% <0.00%> (+1.75%)	⬆️
lib/run/options.js	95.76% <0.00%> (+2.54%)	⬆️
lib/reporters/cli/cli-utils.js	81.57% <0.00%> (+10.52%)	⬆️
lib/reporters/cli/index.js	86.71% <0.00%> (+22.37%)	⬆️
... and 2 more

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