Release support for DeepSeek

[karthikscale3]

Description

Release support for DeepSeek in OpenAI endpoint.

Checklist for adding new integration:

• Defined APIS in constants folder.
• Updated SERVICE_PROVIDERS in common.py
• Created a folder under instrumentation with the name of the integration with atleast patch.py and instrumentation.py files.
• Added instrumentation in all_instrumentations in langtrace.py and to the InstrumentationType in types.py files.
• Added examples for the new integration in the examples folder.
• Updated pyproject.toml to install new dependencies
• Updated the README.md of langtrace-python-sdk to include the new integration in the supported integrations table.
• Updated the README.md of Langtrace's repository to include the new integration in the supported integrations table.
• Added new integration page to supported integrations in Langtrace Docs