Add TS|TSX|JSX files count in `javascripts` count

[hmdros]

Closes: https://github.com/fastruby/rails_stats/issues/26

• [x] Add an entry to CHANGELOG.md that links to this PR under the "main (unreleased)" heading.

Description:

This PR adds support to include .ts, .tsx and .jsx files to the Javascripts count of the output of rake stats command run.

I will abide by the code of conduct.