feat: introduce helper functions for dynamic tracer import

[ogabrielluiz]

This pull request includes the following changes:

• Removed an unused import in langwatch.py.

• Introduced helper functions _get_langsmith_tracer and _get_langwatch_tracer in tracing/service.py to dynamically import tracers.

These changes improve the development and testing experience and enhance the flexibility of tracer imports in the tracing service.

[github-actions]

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_{Last Modified at 17 Jul 24 23:54 UTC}