feat(python): transition Python remote sdk to use Rust implementation (#1701)

* Replaces Python implementation of Remote SDK with Rust one.
* Drops dependency on `attrs` and `cachetools`. Makes `requests` an
optional dependency used only for embeddings feature.
* Adds dependency on `nest-asyncio`. This was required to get hybrid
search working.
* Deprecate `request_thread_pool` parameter. We now use the tokio
threadpool.
* Stop caching the `schema` on a remote table. Schema is mutable and
there's no mechanism in place to invalidate the cache.
* Removed the client-side resolution of the vector column. We should
already be resolving this server-side.

python/pyproject.toml

@@ -3,13 +3,11 @@ name = "lancedb"
 # version in Cargo.toml
 dependencies = [
     "deprecation",
+    "nest-asyncio~=1.0",
     "pylance==0.19.2-beta.3",
-    "requests>=2.31.0",
     "tqdm>=4.27.0",
     "pydantic>=1.10",
-    "attrs>=21.3.0",
     "packaging",
-    "cachetools",
     "overrides>=0.7",
 ]
 description = "lancedb"
@@ -61,6 +59,7 @@ dev = ["ruff", "pre-commit"]
 docs = ["mkdocs", "mkdocs-jupyter", "mkdocs-material", "mkdocstrings[python]"]
 clip = ["torch", "pillow", "open-clip"]
 embeddings = [
+    "requests>=2.31.0",
     "openai>=1.6.1",
     "sentence-transformers",
     "torch",