Add native local scope for Windows/Linux

[tustanivsky]

This PR adopts the local scope implementation changes for sentry-native discussed in getsentry/sentry-native#1226.

Instead of applying scope data to each outgoing event via the before_send handler, the SDK now uses a write-only sentry_scope_t instance which is then passed to the new sentry_capture_event_with_scope function. Also, with this approach global scope can be modified directly via native's API (tags, level, etc.) which addresses the issue with missing context values for fast-fail crashes.

Breaking changes:

• Dist and Environment properties are now set during the SDK initialization via options, no more corresponding set/get functions in Scope class.
• Since Hub & Scope refactoring docs suggest deprecating ConfigureScope function and it'll become no-op after switching to native's local scopes anyway it was removed for USentrySubsystem.

Note: adding breadcrumbs via sentry_add_breadcrumb to global scope unblocks further work on getsentry/sentry-native#1166 as custom handling for the corresponding event in Unreal plugin is no longer required.

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