feat(provider-generator): reference computed values nested in lists

[DanielMSchmidt]

Resolves #1332

[jsteinich]

This change really only addresses 1 & 3 from #1332 (comment).
That's an improvement, but it would be nice to just finish it off finally.

Also, regarding number 3,

terraform-cdk/packages/@cdktf/provider-generator/lib/get/generator/emitter/struct-emitter.ts

Line 197 in 52de5d4

`public constructor(terraformResource: cdktf.ITerraformResource, terraformAttribute: string, isSingleItem: boolean)`

really should take IInterpolatingParent. Functionally it works, but we are masking the compile error with

terraform-cdk/packages/@cdktf/provider-generator/lib/get/generator/emitter/attributes-emitter.ts

Line 121 in 52de5d4

}(this as any, "${att.terraformName}", ${

.

This does also generate some dangling types (since the 2nd case is not implemented).

[DanielMSchmidt]

@jsteinich Number two is planned to be tackled by #993

[jsteinich]

Just one remaining question. Otherwise it looks good.

[github-actions]

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