custom themes lack `match` and `case` syntax highlighting

[scarf005]

default themes and github themes support match case syntax, however majority of other themes does not support them out of the box.

running Inspect editor tokens and scopes shows result like this:

could there be any way to overwrite custom themes to support match case? (using editor.tokenColorCustomizations for every single themes would too much work)

Originally posted by @scarf005 in https://github.com/microsoft/pylance-release/issues/1215#issuecomment-1221215157