feat: add Cohere embedding integration

[bwook00]

Description

Add Cohere Embedding provider

@Pouyanpi,
I added it along with #1304.
(It probably conflicts with 1304)

Checklist

• I've read the CONTRIBUTING guidelines.
• I've updated the documentation if applicable.
• I've added tests if applicable.
• @mentions of the person or team responsible for reviewing proposed changes.

[github-actions]

Documentation preview

https://nvidia.github.io/NeMo-Guardrails/review/pr-1305

[Copilot]

Pull Request Overview

This PR adds Cohere as a new embedding provider to the NeMo Guardrails framework, enabling users to use Cohere's embedding models for document encoding tasks.

• Implements CohereEmbeddingModel class with both synchronous and asynchronous encoding methods
• Adds comprehensive test coverage for the new Cohere integration
• Updates documentation to include Cohere in the supported embedding providers table

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
nemoguardrails/embeddings/providers/cohere.py	Implements the CohereEmbeddingModel class with sync/async encoding capabilities
nemoguardrails/embeddings/providers/init.py	Registers the new Cohere embedding provider in the system
tests/test_embeddings_cohere.py	Adds comprehensive test coverage for Cohere embedding functionality
tests/test_configs/with_cohere_embeddings/config.yml	Test configuration file for Cohere embeddings setup
tests/test_configs/with_cohere_embeddings/config.co	Test flow configuration for validating Cohere integration
docs/user-guides/configuration-guide.md	Updates documentation to include Cohere in supported providers table

Comments suppressed due to low confidence (1)

tests/test_embeddings_cohere.py:70

• Function name test_live_query is duplicated. This function should have a distinct name like test_live_query_sync to differentiate it from the async version on line 52.

def test_live_query(app):

[Copilot]

The commented-out async implementation should be removed or properly documented with a TODO/FIXME comment explaining when it might be re-enabled, rather than leaving dead code in the implementation.

[Pouyanpi]

@bwook00 Thank you for your PR 🎉

Would you please enable pre-commits and apply it? Please see contributing guidelines.

once it is enabled you can do:

poetry run pre-commit run --all-files

[codecov-commenter]

Codecov Report

❌ Patch coverage is 42.85714% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.40%. Comparing base (bee719b) to head (025c4f7).

Files with missing lines	Patch %	Lines
nemoguardrails/embeddings/providers/cohere.py	38.46%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1305      +/-   ##
===========================================
- Coverage    70.45%   70.40%   -0.05%     
===========================================
  Files          161      162       +1     
  Lines        16214    16241      +27     
===========================================
+ Hits         11423    11434      +11     
- Misses        4791     4807      +16     

Flag	Coverage Δ
python	70.40% <42.85%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
nemoguardrails/embeddings/providers/__init__.py	96.42% <100.00%> (+0.13%)	⬆️
nemoguardrails/embeddings/providers/cohere.py	38.46% <38.46%> (ø)

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[bwook00]

@Pouyanpi Thank you for your kind review 😃
Along with this branch, I applied pre-commit too #1304