Terraform: provider/fastly: Implement condition support for Headers, others

[catsby]

For the first phase of development in the Fastly provider, support for conditions on attributes like headers or gzip (probably others) was not implemented. The various conditions each could use was left as a computed, not user specifiable attributes.

When request_settings, support for conditions needed to be available, and at that point conditions were added, but I did not circle back and add support for them in headers, et.al.

Now that conditions are available, we need to support them across all attributes possible.

[heythisisnate]

+1

Also Fastly supports applying conditions to a backend, which I would love to see supported here as well.

[hernan82arg]

+1

[invizinviz]

+1

[jeremylivingston]

This would be a great addition, as I'm unable to import quite a few of my services due to this limitation. Is there a timeframe for when this addition is expected? I'd be happy to help with any development if it's needed.

[msuterski]

@heythisisnate request_condition in backend is now in master

[catsby]

Hey looks like this was all addressed in #11843, thanks! And sorry for the delay on my part :/

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