Add mts and cts TypeScript extensions

[nicolo-ribaudo]

Description

TypeScript 4.7 introduced two new extensions: .mts and .cts - https://devblogs.microsoft.com/typescript/announcing-typescript-4-7-beta/#new-file-extensions
They are already widely used on GitHub, because they were initially announced for TypeScript 4.5 a few months ago.

Checklist:

• I am associating a language with a new file extension.
  • The new extension is used in hundreds of repositories on GitHub.com
    • Search results for each extension:
      • mts: https://github.com/search?q=extension%3Amts+NOT+nothack&type=Code
      • cts: https://github.com/search?q=extension%3Acts+function+NOT+nothack&type=Code NOTE: This doesn't meet the 200 threshold yet. However, these two extensions are meant to be "parallel" so it makes sense to support both of them.
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • For .mts I added https://github.com/nicolo-ribaudo/yarn-plugin-conditions/blob/main/sources/conditionParser.ts
      • For .cts I added https://github.com/nicolo-ribaudo/yarn-plugin-babel-release-tool/blob/main/sources/utils/node.ts
    • Sample license(s):
      • MIT (https://github.com/nicolo-ribaudo/yarn-plugin-babel-release-tool/blob/0c289ca7eeebc05ce5ce31bb77291d633ffbaecf/package.json#L5, https://github.com/nicolo-ribaudo/yarn-plugin-conditions/blob/daf427b206efb1d56ce93ed28983496cef6ee012/LICENSE). I own the copyright of these files, so I'm happy to just "gift" it to this repo.
  • I have included a change to the heuristics to distinguish my language from others using the same extension.
    These extensions are not used by any other language in languages.yml

[keithamus]

LGTM

[lildude]

Please don't rename an existing sample. Please add another sample with the new extension instead. These samples are used to train the classifier for that particular extension so "removing" by renaming could affect the results.

[Alhadis]

@nicolo-ribaudo To elaborate on @lildude's feedback, we'll two new samples, one for .cts and another for .mts. I recommend finding a genuine example instead of copy+pasting the contents of promisified_cp.cts as promisified_cp.mts.

So to recap, the contents of samples/TypeScript should contain:

 samples/TypeScript/cache.ts
+samples/TypeScript/promisified_cp.cts
+samples/TypeScript/{SOMETHING_NEW}.mts

[nicolo-ribaudo]

Examples updated!

[Josh-Cena]

Suggestion: I think we can showcase some .mts/.cts-only features—for example, import.meta can only be used in .mts files, and export = can only be used in .cts files

[lildude]

I plan to make a new release next week. It'll be great if we can get mts and cts specific samples as they're used to train the classifier so the more representative the samples, the better the classifier.

[nicolo-ribaudo]

Done!