Upgrade Core & Common

[macdrevx]

Fixes: #571

Pull request checklist:

• Briefly describe the changes in this PR.
• Document any changes to public APIs.
• Apply changelog label ('breaking change', 'bug 🪲', 'build', 'docs', 'feature 🍏', 'performance ⚡', 'testing 💯') or use the label 'skip changelog'
• Update the changelog

Summary of changes

• Updates to MapboxCoreMaps v10.0.0 and MapboxCommon v20.0.0.

Public API Changes

• Core and Common APIs that accept user-defined implementations of protocols now hold strong references to the provided objects. Please audit your usage of the following protocols and make any required changes to avoid memory leaks: CustomLayerHost, ElevationData, MapClient, MBMMetalViewProvider, Observer, OfflineRegionObserver, HttpServiceInterceptorInterface, HttpServiceInterface, LogWriterBackend, OfflineSwitchObserver, ReachabilityInterface, TileStoreObserver

Other changes

• Updates CustomLayerExample, OfflineRegionManagerExample, and SceneKitExample to avoid memory leaks
• MapView's stored reference to mapClient is no longer necessary and has been removed.
• eventHandlers properties of MapboxMap and Snapshotter are now lets.
• Reorganized some comments
• Removed some unnecessary MARK separating lines
• Disabled part of a MigrationGuideIntegrationTests test case that invoked HttpServiceFactory.setUserDefinedForCustom to avoid modifying shared global state that could impact other tests.
• Deleted unused DelegatingObserver and associated delegate protocol

[neelmistry94]

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