feat(flags): Adds Growthbook integration

[madhuchavva]

Adds GrowthBook's integration for tracking feature evaluations.

This PR includes changes to wrap isOn, getFeatureValue and evalFeature methods, record results of type (booleans, strings, numbers, null, objects/arrays) and attach them to active span or current scope buffer for errors.

[madhuchavva]

@Lms24 Would you approve the workflows to run again?

[aliu39]

Tysm for the integration @madhuchavva !! Will take a look soon

record results of type (booleans, strings, numbers, null, objects/arrays)

For now Sentry is limiting all FF integrations to boolean only. We plan to rollout non-bool support later - would you mind removing those types from this PR?

[aliu39]

relates to getsentry/sentry#82157

[aliu39]

Suggested change

	typeof result !== 'undefined' &&
	typeof result !== 'function' &&
	typeof result !== 'symbol'
	typeof result === 'boolean'

[aliu39]

Just wondering if we can support this in node too, by moving the integration to core - what are the differences in the GrowthBookClass template and evaluation methods? In https://docs.growthbook.io/lib/node it looks like they take a userContext arg - could we workaround this by handling additional args in the patcher?