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Fixes #1572
TSQL temp tables are identified by a single-hash or double-hash prefix.
https://docs.microsoft.com/en-us/sql/t-sql/statements/create-table-transact-sql?view=sql-server-ver15#temporary-tables
TSQL changes:
+hash_prefix RegexLexer
+inline_comment RegexLexer patch to remove hash commenting
+HashIdentifierSegment to represent a hash-prefixed temp table identifier
Adjust SingleIdentifierGrammar to add HashIdentifierSegment
Test case changes:
+tsql/temp_tables.sql to test temp table identification