[ios, macos] Corrected polyline equality

Now that annotation classes override -isEqual:, it’s no longer appropriate to rely on -isEqual: or -containsObject: to check for the preexistence of an annotation. Those methods become deep equality tests, which have worse performance. Checking for identity allows the developer to add a polyline and polygon with identical coordinates, title, etc. to the map.

Implemented a missing -[MGLPolyline isEqual:].

Removed outdated comments about -annotationTagForAnnotation: being expensive.

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