* `QDRANT_HOST` variable is used by all openapi tests, removed its copies from
`test_multi_vector_uint8.py`, `test_multi_vector_unnamed.py`, `test_query.py`,
`test_shard_snapshot.py`, and `test_snapshot.py`
* Added optional `QDRANT_HOST_HEADERS` env variable to set custom HTTP headers
in order to reach Qdrant instance behind a reverse proxy. The content of the
variable is JSON payload, e.g. `{"host": "qdrant.local"}`
* Adapted `./tests/basic_*.sh` scripts to aware of `QDRANT_HOST_HEADERS` env variable
* Allow multivec search on legacy REST API
* show that it works for gRPC as well
* better error message
* update error assertion
* show validation on REST as well
* remove unecessary test
* fix conversion - dim is not vec count
* fmt
* Use TypedMultiDenseVectorRef everywhere (#4224)
* Use TypedMultiDenseVectorRef everywhere
* remove obsolete test
* fix codespell
* fix build
* test single dense vector expansion on upsert
---------
Co-authored-by: Ivan Pleshkov <pleshkov.ivan@gmail.com>
