Reference: #94
Reference: #99
Reference: #100
Reference: #128
Reference: #133

Reverts incorrect logic for handling DynamicPseudoType values in `tftypes`. This type information must be preserved when traversing the protocol, as Terraform CLI decodes values based on the schema information. If a concrete value type is used where DynamicPseudoType is expected, Terraform CLI will return errors such as (given an object of 4 attributes, when DynamicPseudoType is expected):

```
│ Error: ["manifest"]: msgpack: invalid code=84 decoding array length
```