feat(oss): replace custom resource with l1 cfnindex

[krokoko]

Fixes #1054

• Remove custom resource and Docker dependency for OSS Index
• Use instead the newly released OSS CfnIndex L1 construct

Current status:

• Need to finish implementation (add the fromVectorIndexAttributes and fromCfnIndex methods)
• Review interfaces and include helper methods if needed
• Finish documentation
• Test !

Blockers:
The newly released L1 index prevents feature parity with existing implementation:

• It seems the field data_type (see documentation here: https://opensearch.org/docs/latest/tutorials/vector-search/vector-operations/semantic-search-byte-vectors/) is missing, which provides a way to specify if the embeddings will be stored as binary or float when using with Bedrock KB. We are currently doing this operation using a custom resource but I don't see the needed field exposed through the PropertyMapping field.
• It seems analyzers are not exposed at the moment as well through the IndexSettings. We also configure it through a custom resource for now

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