Add Embedding frontend

[mfuntowicz]

Summary

This Pull Request introduces enhancements and new functionality to the existing codebase. The changes include the addition of a robust embeddings implementation, XML configurations for integration workflows, and various dependency updates. Some unused or verbose code has been removed for better readability and maintenance.

Main Changes:

Integration Workflow Update:

• Added a new repository embeddings-sentence-transformers-cpu to the GitHub Actions workflow configuration.

Core Code Enhancements:

• Defined a new TestError in Rust's error handling for better logging/debugging.

Embeddings Implementation:

• Introduced a new embeddings module to generate vector representations.
• Added Python bindings for the embeddings API, complete with utility classes like EmbeddingRequest, EmbeddingResponse, etc.
• Integrated testing cases for embeddings functionality with detailed scenarios.

Dependency Updates:

• Upgraded or added dependencies such as rust-numpy, numpy, and timeout utilities in various manifests.
• Enhanced configuration slots and introduced a debug flag for endpoints.

Code Cleanup:

• Removed the excessive use of logging instrumentation in specific parts of the Python handler. Simplified redundant or verbose annotations.

Versioning:

• Updated crate versions and adjusted Python packaging to reflect these changes.

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