feat(cli): add JSON Schema for lerna.json

[ghiscoding]

Description

Adds a JSON Schema to lerna.json

Motivation and Context

As per Lerna PR 3229

This change improves the developer experience of Lerna. Now, when modifying lerna.json, users can see what properties are valid and a brief description of what they do (taken from the lerna command options documentation).

Note: All options for commands (as described in the command docs) are valid configuration options in lerna.json. They can be provided at three levels, in order of priority:

Command line inline option

1. lerna.json, under a specific command
2. Top level of lerna.json
3. The JSON schema for lerna.json supports supplying options at both level 2 and 3 above.

How Has This Been Tested?

I tested the schema by changing lerna.json in this repo and observing (in my editor) the metadata from the schema. I did not manually test every configuration option for every command. I obtained the metadata from the configuration code for each of the Lerna commands (command.js), with some input from the docs.

Types of changes

• Chore (change that has absolutely no effect on users)
• 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)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #305 (6b5cd53) into main (5927f80) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #305   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         145      145           
  Lines        4224     4224           
  Branches      883      883           
=======================================
  Hits         4061     4061           
  Misses        163      163           

Impacted Files	Coverage Δ
packages/init/src/init-command.ts	100.00% <100.00%> (ø)

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