Use schema.ResourceTimeout to infer sync vs async Apply/Destroy

[turkenh]

What problem are you facing?

In PR #76, @muvaf implemented two different modes for Apply and Destroy operations, namely sync and async.
Currently, the operation mode per resource is expected as input from provider developers. However, Terraform resource schema already has a per resource ResourceTimeout which was implemented by provider authors. We can leverage this information to decide on which mode to choose by default (still consider opening a configuration to override it).

For example, AWS RDS cluster has a default of 120 mins and we could choose the async mode. For resources that have no timeouts set or timeouts less than a sensible threshold, e.g. 5 mins, we can choose the sync mode.

How could Terrajet help solve your problem?

Leverage ResourceTimeout to decide which operation mode to use by default.

[stale]

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