add support for datastream lifecycle

[aizerin]

resolves #673

[cla-checker-service]

💚 CLA has been signed

[tobio]

Thanks for adding this in. one small change to make this work when lifecycle isn't defined.

[tobio]

The tests are failing when lifecycle is not defined in the TF module. I'm pretty sure this should fix it, though it's totally untested.

Suggested change

	lifecycle, diags := ExpandLifecycle(definedTempl["lifecycle"].(*schema.Set))
	if diags.HasError() {
	return templ, false, diags
	}
	if lifecycle != nil {
	templ.Lifecycle = lifecycle
	}
	if lc, ok := definedTempl["lifecycle"]; ok {
	lifecycle, diags := ExpandLifecycle(lc.(*schema.Set))
	if diags.HasError() {
	return templ, false, diags
	}
	if lifecycle != nil {
	templ.Lifecycle = lifecycle
	}
	}

[aizerin]

Sorry for mistake. I didn't test newly created index. I fixed it in ExpandLifecycle function.

[tobio]

@aizerin are you able to add an entry to the CHANGELOG for this one as well please?

[aizerin]

I have pushed one more fix. Tests should work now.

[tobio]

LGTM. Thanks for taking the time to get this added in!