Allow Custom String Representation of Constructs

[skorfmann]

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Description

For some constructs / resources allowing custom type coercions could be very useful to enable an idiomatic usage.

For TerraformLocals I think it would make sense to add the following to the Typescript classes.

    public toString(): string {
        return this.asString
    }

This would allow to use it like my-first-table-${local} rather than my-first-table-${local.asString}.

The issue is, that this would only work for Typescript, but none of the other target languages. Python would look like this: "my-first-sns-topic-<cdktf.TerraformLocal object at 0x10cd45190>"

It doesn't look like, that Jsii is handling this automatically if there's toString() function defined. Defining the required method for Python in the Typescript class manually only works as @internal and therefore wouldn't be compiled via jsii.

 /** @internal */
    public __str__(): string {
        return this.asString
    }

I think there are more cases where this becomes relevant. In the best case this would be addressed in Jsii directly.

References

• toString should implicitly always proxy to jsii aws/jsii#380
• Simple Terraform Locals #357 (review)