Support for filters

Add support for fast filtered-search

Streaming support

Support for concurrent inserts and deletes for in-memory index.

support for inner product and range search

New features

• Inner product search
• Range search
• Partition generation on the fly for indexing datasets larger than memory.

DiskANN code with support for L2 metric.

This release consists of in-memory and SSD version of DiskANN code in C++ with support for L2 metric.