[ENH] Add Segment Interfaces (#1853)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
- Adds an interface type for segments. We can add flush etc here in the
future. I will move hnsw to use this in a stacked PR.
 - New functionality
	 - None.

## Test plan
*How are these changes tested?*
No logical changes. These are just interfaces.
- [x] Tests pass locally with `pytest` for python, `yarn test` for js,
`cargo test` for rust

## Documentation Changes
None

rust/worker/src/segment/mod.rs

@@ -2,6 +2,7 @@ pub(crate) mod config;
 mod distributed_hnsw_segment;
 mod segment_ingestor;
 mod segment_manager;
+mod types;
 
 pub(crate) use segment_ingestor::*;
 pub(crate) use segment_manager::*;

rust/worker/src/segment/types.rs

@@ -0,0 +1,12 @@
+use crate::types::EmbeddingRecord;
+
+trait SegmentWriter {
+    fn begin_transaction(&self);
+    fn write_records(&self, records: Vec<Box<EmbeddingRecord>>, offset_ids: Vec<u32>);
+    fn commit_transaction(&self);
+    fn rollback_transaction(&self);
+}
+
+trait OffsetIdAssigner: SegmentWriter {
+    fn assign_offset_ids(&self, records: Vec<Box<EmbeddingRecord>>) -> Vec<u32>;
+}