feat: migrated to the latest DIAL SDK

[adubovik]

Mainly migrated embeddings endpoint implementation to the API provided by SDK.

Supported image embeddings amazon.titan-embed-image-v1 in the following way:

{
    "input": [],
    "custom_input": [
        [
            "inputText",
            {
                "type": "image/png",
                "url": "DIAL_URL or public URL",
                "data": "or base64 encoded image data" 
            }
        ]
    ]
}

[adubovik]

/deploy-review

Environment URL: https://chat-ai-dial-adapter-bedrock-pr-127.nightly-test.deltixhub.io
E2E tests status: failed

[adubovik]

/deploy-review

Environment URL: https://chat-ai-dial-adapter-bedrock-pr-127.nightly-test.deltixhub.io
E2E tests status: failed