Implement iterator/async iterator support for web crypto digest

[jasnell]

What is the problem this feature will solve?

Per w3c/webcrypto#390 ...

The crypto.subtle.digest(...) method will soon allow passing both an iterator or async iterator in addition to a BufferSource. The implementation will need to be updated to support it. Eventually crypto.subtle.sign(...) and crypto.subtle.verify(...) will also support iterator inputs.

What is the feature you are proposing to solve the problem?

Modifying the web crypto impl to support streaming inputs.

What alternatives have you considered?

No response

[github-actions]

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[GypsyS44]

w3c/webcrypto#390
crypto.subtle.digest(...)

[GypsyS44]

w3c/webcrypto#390
crypto.subtle.digest(...)
crypto.subtle.sign(...) and crypto.subtle.verify(...)