Add automatic hashable and equatable conformances

[bryankeller]

Details

This removes the manual Equatable implementations and adds automatic Hashable conformances for public types. I imagine some people will find these automatic conformances useful in their feature code (Airbnb, for example 😆)

Related Issue

N/A

Motivation and Context

• Remove error-prone manual Equatable conformances
• Having them be Hashable means people's feature code can store these types in sets and dictionaries, or as properties in other Hashable / Equatable types

How Has This Been Tested

Made sure the Example app built and ran correctly

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.