feat(native): add traces_sampler support

[JoshuaMoelans]

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Related to native-SDK PR getsentry/sentry-native#1108

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[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.37MB	9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.3MB	6 bytes (-0.0%) ⬇️

[coolguyzone]

Looks good, thanks for updating!