Cardano Updates

1) Errors for all hash types + Address now annotate their type in the error
for better error messages like with the other existing types.

2) Re-add TransactionBody::hash() + sign() which existed before but were
   deleted in the shelley.cddl re-generation of lib.rs

3) Change the commented-out example transaction creation from js to use
   TransactionBody::sign() and shorten the address used in the example
   to use 28-byte payment cred hash instead of 32-byte.

4) Re-generated the flow type annotations for the rust lib.

The old FromBytes returns Result<T, JsValue> which always gives the same
error message saying you can't use it from non-wasm targets.

Now that helper-trait is non-public and named WasmFromBytes, and a new
non-wasm friendly FromBytes takes its place.

We've made 2 core changes to cddl-codegen:

1) Swap all wasm-exposed functions to take by-ref for rust-wasm structs
   and clone to be more foolproof memory-wise from js/wasm

2) Serialize everything using definite encoding instead of indefinite
   which a) should be more likely to be compatible with IOHK's haskel
   code and b) takes up 5% or so less space for txs

Some additions to shelley.cddl were made by IOHK since we last generated
using it as well like reward accounts so those were added too.

The ordering of the lib/serialization files is totally changes since
this time I used the shelley.cddl file mostly untouched, whereas last
time it was edited to get rid of out-of-order declarations e.g.
transaction being declared before transaction_body which it references,
but now cddl-codegen can handle that.