Update v1.2.0 alpha.5

[euphoria0-0]

Update enVector version: 1.2.0a5

• The package of SDK is renamed as pyenvector instead of es2. Please install the SDK with pip install pyenvector==1.2.0a5.
• The format of keys are changed. The previous version of the keys are not working in the current version. Please recommend to remove the previous versions of the key to run correctly.
• The corresponding version of docker image is v1.2.0-alpha.5.
• Updated README_ENVECTOR.md.

[Copilot]

Pull request overview

This PR updates the enVector integration to version 1.2.0 alpha.5, which includes a significant breaking change: the SDK package has been renamed from es2 to pyenvector. The update also changes the key format, requiring users to remove previous versions of keys for correct operation.

Key Changes:

• Renamed SDK package from es2 to pyenvector throughout the codebase
• Updated Docker image references to version v1.2.0-alpha.5
• Enhanced documentation with additional benchmark instructions and CLI options

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
vectordb_bench/backend/clients/envector/envector.py	Replaced all es2 imports and references with pyenvector (aliased as ev), updated dictionary access pattern, and removed debug logging
README_ENVECTOR.md	Updated installation instructions to use pyenvector==1.2.0a5, corrected Docker image versions, improved documentation formatting, and added comprehensive benchmark instructions
README.md	Updated title and added formatted quick start reference to enVector documentation

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