chore: add .npmrc & update ignore files

[erisu]

Platforms affected

n/a

Motivation and Context

Add and update configuration files.

Description

• Added .npmrc
• Added licence_checker.yml to .npmignore
• Cleanup .gitignore
• Make sure npm pack does not pack any *.tgz

Testing

• npm i
• npm t
• npm pack --dry-run

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.06%. Comparing base (90e6b80) to head (3355c4c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   91.06%   91.06%           
=======================================
  Files           1        1           
  Lines         179      179           
=======================================
  Hits          163      163           
  Misses         16       16           

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