disposeSession method
Implementation
void disposeSession(String session) {
_parsers.removeWhere((key, _) => key.$1 == session);
_parserInstanceIds.removeWhere((key, _) => key.$1 == session);
_parserCreationCounts.remove(session);
_trees.remove(session);
_inputs.remove(session);
_revisions.remove(session);
_sessionGrammars.remove(session);
_spanCaches.remove(session);
}