Added Endee Client Support

[MithunEndee]

This PR integrates Endee VectorDB (https://endee.io) into VectorDBBench. It provides a complete client implementation, allowing users to benchmark Endee's performance (insertion, search, filtering) against other vector databases supported by the framework.

Key Changes

New Client Implementation:

• vectordb_bench/backend/clients/endee/endee.py: Implements the VectorDB abstract base class, handling connection, data insertion, and vector search with filtering support.
• vectordb_bench/backend/clients/endee/config.py: Defines Pydantic models for configuration validation (token, index name, dimensionality, etc.).
• vectordb_bench/backend/clients/endee/cli.py: Adds CLI command support using click.

Integration & Registry:

• Registered Endee in vectordb_bench/backend/clients/__init__.py.
• Added the endee command to the main CLI entry point in vectordb_bench/cli/vectordbbench.py.
• Added endee dependency to pyproject.toml.
• Added endee logo in vectordb_bench/frontend/config/styles.py.

Documentation:

• Updated README.md to include Endee in the list of supported clients.

[sre-ci-robot]

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[XuanYang-cn]

@MithunEndee THX for the contribution of endee. Please fix the conflict with the latest code