Adds Blackbird queries

[BekaValentine]

This PR adds queries to support GH code search.

Blackbird is the name of the GH code search tool that tags.scm was intended to support. For some reason the code search team was not using ts-internal tag queries and was instead using their own custom queries and we're now moving those queries upstream so that any service that wants to index name symbols in a way consistent with other services can rely on the tag queries.

Checklist:

• All tests pass in CI.
• The script/parse-examples passes without issues.
• There are sufficient tests for the new fix/feature.
• Grammar rules have not been renamed unless absolutely necessary.
• The conflicts section hasn't grown too much.
• The parser size hasn't grown too much (check the value of STATE_COUNT in src/parser.c).

[aryx]

Care to explain what blackbird queries are?

[BekaValentine]

Care to explain what blackbird queries are?

Sure! Blackbird is the name of the GH code search tool that the tags.scm was intended to support. For some reason the code search team was not using ts-internal tag queries and was instead using their own custom queries and we're now moving those queries upstream so that any service that wants to index name symbols in a way consistent with other services can rely on the tag queries.

[aryx]

Would be nice to add comment explaining the use of this export_statement
thing but whatever.