feat: add command line interface

[dbjorge]

Description of changes

Adds an axe-sarif-converter CLI tool to wrap the library and associated acceptance tests. Proposed usage:

> axe-sarif-converter --help
axe-sarif-converter: Converts JSON files containing axe-core Result object(s)
into SARIF files

Options:
  --help             Show help                                         [boolean]
  --version          Show version number                               [boolean]
  --input-files, -i  Input JSON file(s) containing axe-core Result object(s).
                     Does not support globs. Each input file may consist of
                     either a single root-level axe-core Results object or a
                     root-level array of axe-core Results objects.
                                                              [array] [required]
  --output-file, -o  Output SARIF file. Multiple input files (or input files
                     containing multiple Result objects) will be combined into
                     one output file with a SARIF Run per axe-core Result.
                                                             [string] [required]
  --verbose, -v      Enables verbose console output.  [boolean] [default: false]
  --pretty, -p       Includes line breaks and indentation in the output.
                                                      [boolean] [default: false]
  --force, -f        Overwrites the output file if it already exists.
                                                      [boolean] [default: false]

Examples:
  axe-sarif-converter -i axe-results.json -o axe-results.sarif

Looking for a review of both the command line interface and also the code.

Pull request checklist

• PR title respects Conventional Commits (starts with fix:, feat:, etc, and is suitable for user-facing release notes)
• PR contains no breaking changes, OR description of both PR and final merge commit starts with BREAKING CHANGE:
• [n/a] (if applicable) Addresses issue: #0000
• Added relevant unit tests for your changes
• Ran yarn precheckin
• Verified code coverage for the changes made

[dbjorge]

The other option for this would be to use a separate axe-sarif-converter-cli package for it; this would avoid the yargs dependency for non-CLI users but would be a little more complex to manage. I imagine virtually all users of this package will use it as a devDependency (where the extra transitive dep isn't so important), so my inclination would be to do the simpler option in the same package, but I could be convinced otherwise.

[ada-cat]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀