Support MariaDB database

[HugoWenTD]

MariaDB introduced vector support in version 11.7, enabling MariaDB
Server to function as a relational vector database.
https://mariadb.com/kb/en/vectors/

Now add support for MariaDB server, verified against MariaDB server
of version 11.7.1:

• Support MariaDB vector search with HNSW algorithm, support filter
  search.
• Support index and search parameters:
  • storage_engine: InnoDB or MyISAM
  • M: M parameter in MHNSW vector indexing
  • ef_search: minimal number of result candidates to look for in the
    vector index for ORDER BY ... LIMIT N queries.
  • max_cache_size: Upper limit for one MHNSW vector index cache
• Support CLI of vectordbbench mariadbhnsw.

[sre-ci-robot]

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[HugoWenTD]

/assign @XuanYang-cn

[liliu-z]

/assign @alwayslove2013

[vuvova]

Please wait with merging this until MariaDB vector support is actually released (it's expected to happen within a month). The syntax and configuration settings can still change from the dev branch

[HugoWenTD]

Updated the commit to adapt syntax in MariaDB 11.7.1 and support filtered search. The small test set works well. Now running some bigger tests to see what I can get.