feat(flags/v8): Add Unleash integration

[aliu39]

Ref https://github.com/getsentry/team-replay/issues/514. Adds an integration for tracking Unleash flag evaluations, by patching the isEnabled method prototype.
Ref https://develop.sentry.dev/sdk/expected-features/#feature-flags

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
634	4	630	303

View the top 3 failed tests by shortest run time

tracing/request/fetch/test.ts should create spans for fetch requests

Stack Traces | 10.1s run time

test.ts:7:11 should create spans for fetch requests

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/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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📢 Thoughts on this report? Let us know!

[chargome]

Looks good, would you want to point that PR at develop and backport it to v8 maybe?

[aliu39]

Looks good, would you want to point that PR at develop and backport it to v8 maybe?

@chargome Sounds good! I opened #15036

[billyvg]

Does this affect typescript at all after we wrap it?

e.g. does your IDE still show the right types after we load this integration?

[aliu39]

Yeah I installed w/yalc, and this is what I get for the wrapped method (same as original):

[aliu39]

Constructor (UnleashClientClass) type was too general and raised lint though, pushing a commit

[billyvg]

Maybe simplify this

Suggested change

	* const unleashIntegration = Sentry.unleashIntegration({unleashClientClass: UnleashClient});
	*
	* Sentry.init({
	* dsn: '___PUBLIC_DSN___',
	* integrations: [unleashIntegration],
	* Sentry.init({
	* dsn: '___PUBLIC_DSN___',
	* integrations: [Sentry.unleashIntegration({unleashClientClass: UnleashClient})],