feat(otel): add OTLP integration

[Litarnus]

Adds OTLP support by providing an Integration.

It use it, it's necessary to add the integration in the init call:

  Sentry\init([
      'dsn' => '___PUBLIC_DSN___',
      'integrations' => [
          new Sentry\Integration\OTLPIntegration(),
      ],
  ]);

Using sentry tracing with OTLP tracing is not supported. If sentry tracing is enabled, the integration will not be registered

[sl0thentr0py]

all lgtm, nice work!

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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