feat(embedders): Add async support for OpenAI document embedder

[mdrazak2001]

Related Issues

• fixes Add run_async for OpenAIDocumentEmbedder #9020

Proposed Changes:

• Add run_async method to OpenAIDocumentEmbedder
• Add _embed_batch_async helper method for batched async embedding

How did you test it?

• Add unit tests for async embedding functionality

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 14156679192

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 41 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 89.887%

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Files with Coverage Reduction	New Missed Lines	%
components/embedders/openai_document_embedder.py	41	59.29%

Totals
Change from base Build 14129937483:	-0.3%
Covered Lines:	10222
Relevant Lines:	11372

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💛 - Coveralls

[Amnah199]

Thanks @mdrazak2001 for your contribution. I left a few comments.