test: add test_collection_ddl cases

[liututu12]

1.Create index functionality to supplement support for all data types, index methods, and metric combinations, as well as       unsupported scenarios;
2.Supplement test cases for the collection.optimize method;
3.After any DDL operation (creating an index, adding/modifying/deleting a column, collection.flush(), optimize(),
etc.), close the collection, reopen it, and write data to check if this process works correctly.

[greptile-apps]

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