feat: add filter to get_block_context_interfaces()

[jasonbahl]

This adds a filter to the get_block_context_interfaces method, allowing 3rd party code to opt-out of ${PostTypeName}EditorBlock Interface(s) from being implemented to a block.

closes #147

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[theodesp]

Hey @jasonbahl Is this for performance reasons? I will try to performate this to check the difference

[jasonbahl]

@theodesp no, it's not performance related (although there might be performance impacts of interfaces being over-applied).

I tried to explain the problem in #147.

Let me know if you need more clarity after reading that issue.