[vector search] Step forward on stability and functionality

[zhiqiang-hhhh]

A huge step forward on stability and functionality.

Functionality

1. Search parameters like ef_search, can be passed to index as session variables. This behavior is same with pg-vector and duckdb vector search plug-in.
2. Correct processing for order by desc. Fallback to brute force search when it is necessary.
3. Support using inner product as index metric and order by inner_product.
4. When metrics of sql dismatches with index, fallback to brute force.

Stability

1. More unit test
2. Virtual column iterator.
3. According to custom script, result of range search, topn search & compound search is almost same with native faiss. The overlap rate of result is more than 90%. The 10% difference is introduced by batch insert mode of native faiss.

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?