The vector-search-validator is a binary tool which do functional and integration tests between scylla and vector-store. It is build in Rust mainly in vector-store repository. This patch adds possibility to write tests on scylladb repository side, compile them together with vector-store tests and run them in `test.py` environment.
There are three parts of the change:
- add sources of validator to the `test/vector_search_validator` directory
- add support for building validator and vector-store in `build/vector-search-validator/bin` directory with or without cmake
- add support for `pytest` and `test.py` to run validator test locally and in the CI environment; this part adds also README to the `test/vector_search_validator` directory
Design for validator integration tests: https://scylladb.atlassian.net/wiki/spaces/RND/pages/39518215/Vector+Search+Core+Test+Plan+Document
References: VECTOR-50
No backport needed as this is a new functionality.
Closesscylladb/scylladb#26653
* github.com:scylladb/scylladb:
vector_search: add vector-search-validator tests
vector_search: implement building vector-search-validator
vector_search: add vector-search-validator sources
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