Implement corefunc_str_resolve_markers

[skyzyx]

Go: corefunc.StrResolveMarkers(string)
TF: corefunc_str_resolve_markers

The original need was wanting to implement something similar to Late Static Binding where markers could be replaced with values, once those values were determined, as late as possible in the execution process. The replacement values would have been variable/local values.

Terraform does not support this natively.

Need to figure out if we can reflect the current state of all locals/variables in Terraform, and whether or not they are resolved values. If so, we could implement (the very edge-casey) LSB support for string replacements using locals/variables.

If we cannot, then this feature is dead in the water.