[Crashlytics] Add attribute for Info.plist to manually force back to mach exception default behavior

[themiswang]

To preventing any unexpected issue for the upcoming release, add an attribute which user can insert into Info.plist to user can force switch back the original behavior

Revert this PR once release goes stable

#no-changelog

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[themiswang]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a temporary feature allowing users to revert to the EXCEPTION_DEFAULT Mach exception behavior on macOS 12+ via an Info.plist flag. This serves as a safeguard for an upcoming release. The implementation is well-contained, correctly passing the new setting from the Info.plist to the Mach exception handler configuration. My review includes minor suggestions to correct typos and enhance test coverage for this new functionality.

[ncooke3]

Good idea!