feat: Add annotation to tweak providedThroughput control for tables

[pbarsotti-glovo]

Issue 2032.

Description of changes:

Following the line of what was implemented for NodeGroups in this PR, the idea is to allow users to indicate via an annotation if the provisioned throughput of a table is managed by ACK's controller or if an external autoscaler is adapting the capacity dynamically.

In case of external autoscaler, the provisioned throughput defined in the spec is ignored during the delta creation phase to avoid updating these values, which could result in a sudden loss of capacity.

[ack-prow]

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[ack-prow]

Hi @pbarsotti-glovo. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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