Rpcv2Cbor implementation does not work with constraints

[drganjoo]

An SDK generated for a Smithy model with shapes that have constraint traits applied fails to compile. Instead of using the wrapping Rust type, the inner data type needs to be used.

The error produced is:

error[E0308]: mismatched types
   |
   |         encoder.str("rangeLongLabel").long(input.range_long_label);
   |                                       ---- ^^^^^^^^^^^^^^^^^^^^^^ expected `i64`, found `RangeLong`
   |                                       |
   |                                       arguments to this method are incorrect
   |

[drganjoo]

Fixed in: #3794

A test has been added that uses the constraints.smithy file to ensure the CBOR implementation works with all constraints.