HelixObs / client-python / 26134624665

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add _TokenProvider and gRPC AuthMetadataPlugin for gateway auth

Instrument now accepts credential + auth_endpoint params:
- _TokenProvider: fetches HelixObs JWT at startup, thread-safe
  refresh 1h before 24h expiry
- _TokenPlugin: gRPC AuthMetadataPlugin for TLS channels (Phase 2)
- Phase 1 (insecure=True): static Authorization header at exporter init
- Phase 2 (insecure=False): composite SSL + per-call metadata credentials

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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