Support parsing MySQL CREATE INDEX with ENGINE_ATTRIBUTE

[TherChenYang]

Fixes #30962.

Changes proposed in this pull request:

• Support parsing MySQL CREATE INDEX with ENGINE_ATTRIBUTE

SQL Case

CREATE INDEX i1 ON t1 (c1) ENGINE_ATTRIBUTE='{"key":"value"}';

CREATE RESOURCE GROUP rg2
  TYPE = SYSTEM
  THREAD_PRIORITY = -20
  DISABLE;

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