void invalidateCache() {
		cache.invalidate();
		tagCountCache = null;
	}
Returns all function tags associated with the given function id.

@param functionId the function id
@return the tags
@throws IOException if there is an issue reading from the db
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionTagManagerDB.java