feat(react-router): Add basic package

[chargome]

Adds a new package @sentry/react-router based on browser and node SDKs

Note: this does not yet create a release for the package, will do that in a separate pr!

closes #14723

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
702	4	698	301

View the top 3 failed tests by shortest run time

tracing/metrics/web-vitals/test.ts captures time origin and navigation activationStart as span attributes

Stack Traces | 30s run time

test.ts:62:11 captures time origin and navigation activationStart as span attributes

tracing/browserTracingIntegration/long-tasks-before-navigation/test.ts doesn't capture long task spans starting before a navigation in the navigation transaction

Stack Traces | 30s run time

test.ts:7:11 doesn't capture long task spans starting before a navigation in the navigation transaction

tracing/dsc-txn-name-update/test.ts updates the DSC when the txn name is updated and high-quality

Stack Traces | 30s run time

test.ts:12:11 updates the DSC when the txn name is updated and high-quality

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