ref(crashpad): pass predefined report ID

[jpnurmi]

This PR is a preparation step for offline caching. It passes a --report-id=<uuid> command-line argument to the crashpad handler to make crashpad use predefined report IDs instead of generating random IDs.

This eliminates a discrepancy between sentry-native and crashpad by allowing both operate on the same event/report IDs. Since #1319, sentry-native pre-generates event IDs (stored in __sentry-event) on startup, and this change makes crashpad use the same ID as report ID. This way, sentry-native's crashpad backend can maintain sentry-specific event-related state without having to communicate everything to crashpad, which makes it easier to convert completed crashpad reports back to sentry envelopes for backend-agnostic offline caching.

See also:

• feat: allow predefined report ID crashpad#144
• Support Offline Caching of Envelopes #1316
• ref: crashpad: pre-generate crash event ID #1319