Add support for SQLITE_LIMIT_PARSER_DEPTH to limit the size of the stack

Add support for SQLITE_LIMIT_PARSER_DEPTH to limit the size of the stack
used by the parser.  This can help prevent deeply nested parse trees that
then cause problems on machines with smaller CPU stacks.  Modify the
%realloc and %free directives of Lemon and add the new %stack_size_limit
directive in support of this capability.

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