Add --count for list operations.

[rabbah]

Description

Related Issue

190.

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [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.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[meryllblanchet]

Thanks for the submission, @rabbah ! Stay tuned for the review.

[codecov[bot]]

Codecov Report

Merging #208 (56a1f38) into master (1b15773) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #208   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         1443      1472   +29     
  Branches       260       277   +17     
=========================================
+ Hits          1443      1472   +29     

Impacted Files	Coverage Δ
src/commands/runtime/action/list.js	100.00% <100.00%> (ø)
src/commands/runtime/activation/list.js	100.00% <100.00%> (ø)
src/commands/runtime/package/list.js	100.00% <100.00%> (ø)
src/commands/runtime/rule/list.js	100.00% <100.00%> (ø)
src/commands/runtime/trigger/list.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 1b15773...56a1f38. Read the comment docs.