Convert TMLanguage to YAML

[scripthunter7]

• Closes https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/61
• Partially solve https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/62

Changes:

• Syntax converted to YAML, GitHub Linguist can parse it directly
• The VSCode extension cannot handle YAML syntax, so the build converts it to PList
• The testing option was created for TMLanguage, I also created an example test (writing the rest of the tests is not the scope of this PR)
• Static test files/project are moved to test/static

@ameshkov FYI: The size of the PR is large mainly because of the syntax conversion / yarn lock

[scripthunter7]

@ameshkov After merging this PR, it is probably necessary to open a PR in Linguist as well, because:

1. We moved the repo
2. We changed the format of tmlanguage

I'll take a look at the Linguist integration after merging this PR to make sure everything is good.

[scripthunter7]

Since there're tests now, it makes sense to add a gh action that runs them

@ameshkov Of course, soon I open another PR that closes this issue: https://github.com/AdguardTeam/VscodeAdblockSyntax/issues/67