Add claude sonnet 3.5 models (jupyterlab#847)

* Update `/clear' to use `Handler`

Builds the message in the help handler and then uses it after clearing chat.

* Add claude-3.5-sonnet

Anthropic's latest model, released 20th June 2024, added.

* Add claude3.5 sonnet

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

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* reverting clear changes

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

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* Update anthropic.py

* [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>

packages/jupyter-ai-magics/jupyter_ai_magics/partner_providers/anthropic.py

@@ -38,7 +38,7 @@ def is_api_key_exc(cls, e: Exception):
 
 class ChatAnthropicProvider(
     BaseProvider, ChatAnthropic
-):  # https://docs.anthropic.com/claude/docs/models-overview
+):  # https://docs.anthropic.com/en/docs/about-claude/models
     id = "anthropic-chat"
     name = "ChatAnthropic"
     models = [
@@ -48,6 +48,7 @@ class ChatAnthropicProvider(
         "claude-3-opus-20240229",
         "claude-3-sonnet-20240229",
         "claude-3-haiku-20240307",
+        "claude-3-5-sonnet-20240620",
     ]
     model_id_key = "model"
     pypi_package_deps = ["anthropic"]

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

@@ -849,6 +849,7 @@ class BedrockChatProvider(BaseProvider, BedrockChat):
         "anthropic.claude-3-sonnet-20240229-v1:0",
         "anthropic.claude-3-haiku-20240307-v1:0",
         "anthropic.claude-3-opus-20240229-v1:0",
+        "anthropic.claude-3-5-sonnet-20240620-v1:0",
     ]
     model_id_key = "model_id"
     pypi_package_deps = ["boto3"]