Add setting allowing to opt-out Crash Reporter wrapper instantiation

[tustanivsky]

This PR adds a new plugin setting that allows disabling the automatic propagation of additional data (e.g., tags and contexts) to Unreal Engine’s Crash Reporter. Disabling this is useful when Crash Reporter is not used/needed as it allows to avoid unnecessary instantiation of the FGenericPlatformSentryCrashContext wrapper object.

Related to:

• Windows default crash handling mechanism is no longer disabled if SDK initialization failed  #901

Closes:

• Provide configuration to disable instantiation of crash reporter #899

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## Unreleased

### Features

- Add setting allowing to opt-out Crash Reporter wrapper instantiation ([#1178](https://github.com/getsentry/sentry-unreal/pull/1178))

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[limbonaut]

Can it be auto-detected if Unreal crash reporter is used instead of adding a setting?

[tustanivsky]

Can it be auto-detected if Unreal crash reporter is used instead of adding a setting?

The suggested setting only gives the user control over whether a corresponding wrapper object is created for custom context propagation. The Crash Reporter may still be used even when this setting is disabled (e.g. in older Unreal Engine versions where crashpad integration isn't supported) so auto-detection may not always work as expected.