PubsubIO: add readMessagesWithAttributesWithCoderAndParseFn

[llamallamaduck]

This change adds readMessagesWithAttributesWithCoderAndParseFn that enables forwarding of the Pubsub message attributes to make them available when applying the provided ParseFn. The new method is similar to readMessagesWithCoderAndParseFn, but adds setNeedsAttributes(true).

Why?

The readMessagesWithCoderAndParseFn of PubsubIO skips forwarding the pubsub message attributes to the provided parse function. In the use case I am solving, the attributes of the message contain the schema fingerprint needed for the parsing.

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[llamallamaduck]

Some checks are failing with

urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'opensource.org'. (_ssl.c:1131)>

Doesn't seem to relate to the changes in this PR.

assign set of reviewers

[llamallamaduck]

assign set of reviewers

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[github-actions]

Reviewers are already assigned to this PR: @m-trieu @johnjcasey

[labianchin]

PTAL @johnjcasey @scwhittle

[scwhittle]

Thanks!

[scwhittle]

Will merge once presubmits have a chance to complete