feat: adding vercel-ai anthropic support

[darshit-s3]

Description

Adding support for Vercel AI Anthropic methods:

• GenerateText
• StreamText
• GenerateObject
• StreamObject

Checklist for adding new integration:

• [ ] Defined APIS in constants folder.
• [ ] Updated SERVICE_PROVIDERS in common.ts
• [ ] Created a folder under instrumentation with the name of the integration with atleast patch.ts and instrumentation.ts files.
• [ ] Added instrumentation in allInstrumentations in init.ts and to the InstrumentationType in types.ts files.
• [ ] Added examples for the new integration in the examples folder.
• [x] Updated package.json to install new dependencies for devDependencies.
• [ ] Updated the README.md of langtrace-typescript-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

[darshit-s3]

requires releasing https://github.com/Scale3-Labs/langtrace-trace-attributes/pull/80

[rohit-kadhe]

LGTM