[ENH] Metadata segment GRPC reader (#2041)

## Description of changes

*Summarize the changes made by this PR.*
 - New functionality
- Metadata segment reader proto types and python implementation.
Rust-side server implementation coming in my next PR.

## Test plan
*How are these changes tested?*

- [x] Tests pass locally with `pytest` for python, `yarn test` for js,
`cargo test` for rust

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need
to make documentation changes in the [docs
repository](https://github.com/chroma-core/docs)?*

chromadb/api/types.py

@@ -394,7 +394,7 @@ def validate_where(where: Where) -> Where:
                     or not all(isinstance(x, type(operand[0])) for x in operand)
                 ):
                     raise ValueError(
-                        f"Expected where operand value to be a non-empty list, and all values to obe of the same type "
+                        f"Expected where operand value to be a non-empty list, and all values to be of the same type "
                         f"got {operand}"
                     )
     return where