Features:
1. Method `DDLParser(...).run(...)` now get argument json=True if you want to get result as json,
but not as Python Object
Fixes:
1. Fixed issue when variables are 'glue' during Struct parse like previously STRUCT<a ARRAY<STRING>,b BOOL> was
extracted like 'STRUCT <aARRAY <STRING>,bBOOL>', now this issue was fixed and it parsed as is STRUCT < a
ARRAY < STRING > ,b BOOL >. Now '>' and '<' always will be with space near them.
2. CHECK CONSTRAINT with functions. Fix for https://github.com/xnuinside/simple-ddl-parser/issues/76.