Fix issue 2089: Add parsing functionality for MySQL CONVERT TO statement #2097
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Summary
This PR addresses issue #2089 by adding support for parsing the CONVERT TO CHARACTER SET clause in ALTER TABLE statements in JSQLParser. Previously, the CONVERT TO CHARACTER SET clause was incorrectly parsed as UNSPECIFIC, causing ambiguity in the interpretation of certain ALTER TABLE statements.
Changes
Updated AlterOperation enum to include CONVERT.
Modified the parser to correctly identify and handle the CONVERT TO CHARACTER SET clause. ( + Collation)