The commit adds a functionality for `pytest` and `test.py` to run
`vector-search-validator` in `sudo unshare` environment. There are already two
tests - first parametrized `test_validator.py::test_validator[test-case-name]`
(run validator) and second `test_cargo_toml.py::test_cargo_toml` (check if the
current `Cargo.toml` for validator is correct).
Documentation for these tests are provided in `README.md`.
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