Add Azure OpenAI embedding support

[Nuvindu]

Purpose

Fixes: ballerina-platform/ballerina-library#8188

[codecov]

Codecov Report

❌ Patch coverage is 87.23404% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.74%. Comparing base (ca012d4) to head (28fde8d).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
ballerina/embedding_provider.bal	87.23%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   56.62%   60.74%   +4.12%     
==========================================
  Files           3        4       +1     
  Lines         302      349      +47     
  Branches       92      103      +11     
==========================================
+ Hits          171      212      +41     
- Misses        131      137       +6     

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[MohamedSabthar]

@Nuvindu Let's bump the minor version

[SasinduDilshara]

This PR is high priority one for the customer QSP

[MohamedSabthar]

@Nuvindu does this EmbeddingProvider support all embedding models available on Azure, or only the OpenAI embedding models that can be hosted on Azure?

[Nuvindu]

@MohamedSabthar It should support all the embedding models available on Azure. User just needs to provide the deployment id relevant to the desired embedding model when initiating the EmbeddingProvider instance.