Fix #263: make sentry_sdk import optional (clean-install ModuleNotFoundError)

[Diogo-Damasceno]

Summary

Fixes #263 — ModuleNotFoundError: No module named 'sentry_sdk' on a clean install.

deepteam/telemetry.py imported sentry_sdk unconditionally at module top level. On a clean pip install deepteam where sentry-sdk was not on the path, that single import raised ModuleNotFoundError and broke every import of deepteam.telemetry (and thus the package).

Changes

• Wrap the sentry_sdk import in try/except and alias it to None when missing — matching the pattern already used for opentelemetry/posthog.
• Guard sentry_sdk.init(...) and sentry_sdk.capture_exception(...) on the optional alias so the module degrades gracefully instead of crashing.
• Declare sentry-sdk, posthog and the opentelemetry-* packages as direct dependencies in pyproject.toml. They were only present in poetry.lock, so a fresh install could end up without them.

Verification

• Added tests/unit/test_telemetry_optional_sentry.py: loads telemetry.py with sentry_sdk blocked and asserts the module imports without error and sentry_sdk is None.
• The test fails against the old unconditional import (reproduces ModuleNotFoundError: No module named 'sentry_sdk' on a clean install of deepteam 1.0.9 #263) and passes with the fix → 2 passed.
• black applied to match repo style.

Note: this does not change telemetry behaviour when sentry_sdk is present; it only removes the hard dependency that made the package unimportable without it.

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