Add Titan embedding model v2 (#778)

* Add Titan embeddning model v2

Included the new embedding model, released recently on Amazon Bedrock.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: srdas

packages/jupyter-ai-magics/jupyter_ai_magics/embedding_providers.py

@@ -98,10 +98,11 @@ class HfHubEmbeddingsProvider(BaseEmbeddingsProvider, HuggingFaceHubEmbeddings):
     registry = True
 
 
+# See model ID list here: https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html
 class BedrockEmbeddingsProvider(BaseEmbeddingsProvider, BedrockEmbeddings):
     id = "bedrock"
     name = "Bedrock"
-    models = ["amazon.titan-embed-text-v1"]
+    models = ["amazon.titan-embed-text-v1", "amazon.titan-embed-text-v2:0"]
     model_id_key = "model_id"
     pypi_package_deps = ["boto3"]
     auth_strategy = AwsAuthStrategy()