fix(sentry): adding profiling

[bassrock]

Summary

Add in Sentry profiling.

Implementation Details

We have made this setup a feature flag so that we can enable and disable Sentry profiling at will due to our Sentry contract supporting a limited number of "profile" traces. Note that the value is controlled via the Payload of the feature flag. We will set this up to 0.25 (25%) for traceSampling and 0.50 (50%) for profileSampling

Note that profile sampling is relative to traceSampling:

IE. if tracesSampler responds with 100%, profilesSampler will be called 100% of the time,
            // if traces responds with 50%, profileSamples will be called 50% of the time.

Note Feature Flags only update values once every 48 hours, currently asking SRE if we need to change this cadence and asking android what they do.

[nzeltzer]

lgtm 🤞

[pocket-ci]

	Messages
📖	No SwiftLint violations! 🎉
📖	Project coverage: 75.98%
📖	Checking XCode Environment Variables
📖	Edited 5 files
📖	Created 1 files

PocketKit: Coverage: 76.13

File	Coverage
PocketAppDelegate.swift	72.14%	✅
FeatureFlagsRefreshCoordinator.swift	38.98%	⚠️
FeatureFlagService.swift	26.53%	⚠️

SharedPocketKit: Coverage: 85.87

File	Coverage
String+Number.swift	0.0%	⚠️
Log.swift	86.45%	✅

Generated by 🚫 Danger Swift against dfff24b

[bassrock]

Waiting on an answer from Sentry about how to do change options after we initialize the SDK