[ENH] Implement K Means (#3159)

## Description of changes

*Summarize the changes made by this PR.*
 - New functionality
	 - Implement the full k-means with regularization and random sampling fully emulating the spann reference implementation

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

## Documentation Changes
None

rust/index/src/spann.rs

@@ -1 +1,2 @@
-pub mod types;
+pub mod types;
+pub mod utils;