feat: Introduce Titan Text Embedding V2

[cagataycali]

Knowledge Bases for Bedrock supports amazon.titan-embed-text-v2:0.

Fixes #492

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[krokoko]

Hi @cagataycali thank you for this PR, did you try to deploy a KB with this model ?

[cagataycali]

Looks like while deploying CDK we're having a regexp error.

Properties validation failed for resource :: with message:
[#/KnowledgeBaseConfiguration/VectorKnowledgeBaseConfiguration/EmbeddingModelArn: string [arn:aws:bedrock:us-east-1::foundation-model/amazon.titan-embed-text-v2:0] does not match pattern ^arn:aws(-[^:]+)?:bedrock:[a-z0-9-]{1,20}:(([0-9]{12}:custom-model
/[a-z0-9-]{1,63}[.]{1}[a-z0-9-]{1,63}/[a-z0-9]{12})|(:foundation-model/[a-z0-9-]{1,63}[.]{1}[a-z0-9-]{1,63}))$]

[krokoko]

I just checked with the cfn team and this is a know issue, I will close this PR for now and provide an update when a fix is available. Will update the related issue as well.

[krokoko]

The underlying issue has been fixed, reopening this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.27%. Comparing base (879aa53) to head (e58c606).

❗ Current head e58c606 differs from pull request most recent head 7833264

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #495   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files          53       53           
  Lines       12562    12565    +3     
  Branches      436      436           
=======================================
+ Hits        11591    11594    +3     
  Misses        971      971           

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[scottschreckengaust]

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