feat: Add source context and vars fields to SentryFrame #53

Job	Run time
Sentry/HybridSDK	1m 33s
Sentry static ios	3m 49s
Sentry static macos	2m 28s
Sentry dynamic macos	2m 45s
Sentry static tvos	2m 5s
Sentry dynamic ios	2m 50s
Sentry dynamic tvos	2m 41s
Sentry dynamic watchos	2m 5s
SentrySwiftUI static tvos	1m 39s
SentrySwiftUI static ios	2m 5s
Sentry static watchos	3m 23s
SentrySwiftUI dynamic ios	2m 9s
SentrySwiftUI static macos	1m 49s
SentrySwiftUI dynamic tvos	1m 36s
SentrySwiftUI dynamic macos	1m 19s
SentrySwiftUI dynamic watchos	1m 42s
SentrySwiftUI static watchos	1m 55s
	37m 53s

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