[lsp-server] `graphql.vscode-graphql-syntax`: Support Python f-strings

## Current Behavior (if applicable)

See the following query in Python:

## Desired Behavior

How it looks like without f-strings (not perfect, but good enough, applygin the same style to f-strings would work):

Using f-strings and/or format allows me to statically check that all dynamic parts of the query are passed in (using Ruff or a type-checker)

## Additional context

No graphql configs.

I do consider switching to GraphQL-style variables (`$filter_query`), but then I'd loose helpful static tooling and need to add an extra query parser for variable interpolation.