Add options to disable BinaryMarshaler/BinaryUnmarshaler support.

[benluddy]

Description

By default, values whose type implements BinaryMarshaler encode to a byte string whose contents are the result of calling MarshalBinary, and decoding a byte string into a BinaryUnmarshaler calls UnmarshalBinary on the contents of the byte string. These options make it possible to disable both behaviors.

PR Was Proposed and Welcomed in Currently Open Issue

• This PR was proposed and welcomed by maintainer(s) in issue #___
• Closes or Updates Issue feature: Option to disable built-in support for BinaryMarshaler and BinaryUnmarshaler #525

Checklist (for code PR only, ignore for docs PR)

• Include unit tests that cover the new code
• Pass all unit tests
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  (see next section).

Certify the Developer's Certificate of Origin 1.1

• By marking this item as completed, I certify
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[fxamacker]

@benluddy LGTM! Thanks!