Add support for automated tests in App Distribution

[lfkellogg]

Description

Adding --test-devices and related flags to appdistribution:distribute action. This will trigger the new Automated Tester feature.

Scenarios Tested

• Kick off tests for a release
• Kick off tests async
• Kick off tests with username/password
• Kick off tests with username/password and resource IDs
• Kick off tests with username but not password (error case)
• Kick off tests with username resource but not password resource (error case)
• Kick off tests with username/password resource but not username/password (error case)

Sample Commands

firebase appdistribution:distribute --app <app id> <path> --test-devices <devices>
firebase appdistribution:distribute --app <app id> <path> --test-devices <devices> --test-async
firebase appdistribution:distribute --app <app id> <path> --test-devices <devices> --test-username <user> --test-password <password>
firebase appdistribution:distribute --app <app id> <path> --test-devices <devices> --test-username <user> --test-password <password> --test-username-resource <resource id> --test-password-resource <resource id>

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (1473c04) 0.00% compared to head (ee32d10) 54.21%.

Files	Patch %	Lines
src/appdistribution/options-parser-util.ts	88.63%	3 Missing and 2 partials ⚠️
src/appdistribution/client.ts	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6730       +/-   ##
===========================================
+ Coverage        0   54.21%   +54.21%     
===========================================
  Files           0      349      +349     
  Lines           0    24247    +24247     
  Branches        0     5010     +5010     
===========================================
+ Hits            0    13146    +13146     
- Misses          0     9899     +9899     
- Partials        0     1202     +1202     

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[joehan]

Code mostly looks good, with a few small style fixes suggested. However, this change needs an approved API proposal since it changes that public API of the CLI. I have some concerns about the API for this command that would be better discussed there. I couldn't find one at go/firebase-api-tracker - could you link one if I missed it, or start one up?