Update __init__.py

[AranavMahalpure]

The change updates the OpenTelemetry Anthropic instrumentation to capture and record system messages as span attributes, improving observability and consistency in LLM interactions. This allows for better insights and metrics regarding the influence of system prompts on language model behavior.

[CLAassistant]

All committers have signed the CLA.

[nirga]

Thanks @AranavMahalpure! A few comments:

• Can you not delete the original PR description and follow the instructions there? They are there for a reason (see following comments)
• Can you write a proper title to the PR? These are used in the release notes of the SDK so they need to be descriptive
• Can you add tests?

[AranavMahalpure]

Hi Nirga,

Thank you for your feedback! I appreciate your insights and will address each of your comments:

Original PR Description: I apologize for removing the original PR description. I understand the importance of maintaining context and following the instructions provided. I will restore the original description and ensure that all relevant information is included as per the guidelines.
Proper Title for the PR: I appreciate your reminder about the title format. I will revise the title to make it more concise and descriptive, following the suggested format for better clarity in the release notes.
Suggested title: [feat][anthropic]: Enhance OpenTelemetry instrumentation to capture system messages as span attributes

Thank you again for your constructive comments. I will make the necessary updates and keep you posted on the progress!

Best,
Aranav Mahalpure