[Improvement] Support index when create Doris table

### What would you like to be improved?

Currently, Gravitino does not support creating a table with an index for Doris table, as Doris table supports index in the creation process, so we need to support it.

### How should we improve?

_No response_

No files, tests, or entry points are named. Begin by tracing the Doris table-creation path and its existing table-creation tests, then clarify the supported index input and expected behavior with maintainers. Done means creating a Doris table with an index succeeds and is covered by a test.

Written by the indexing model from the issue text.