Fix ToPlutusData serializer for V3

This is intense, as we still want to preserve the serializer for V1 &
  V2, and I've tried as much as possible to avoid polluting the
  application layer with many enum types such as:

  ```
  pub enum TxOut {
    V1(TransactionOutput),
    V2(TransactionOutput),
    V3(TransactionOutput),
  }
  ```

  Those types make working with the script context cumbersome, and are
  only truly required to provide different serialisation strategies. So
  instead, we keep one top-level `TxInfo V1/V2/V3` type, and we ensure
  to pass serialization strategies as type wrappers.

  This way, the strategy propagates through the structure up until it's
  eliminated when it reaches the relevant types.

  All-in-all, this strikes a correct balance between maintainability and
  repetition; and it makes it possible to define _different but mostly
  identical_ encoders for the various versions.

  With it, I've been able to successfully encode a V3 script context and
  match it against one produced using the Haskell libraries. More to
  come.

examples/acceptance_tests/run-all-script-contexts

@@ -1,12 +1,14 @@
 #!/usr/bin/env bash
 
+AIKEN=${1:-"cargo run -r --quiet --"}
+
 TESTS=()
 for lang in $(ls script_context); do
   for interaction in $(find script_context/$lang/validators -type f); do
     title=$(basename $interaction)
     title="${title%.*}"
     cd script_context/$lang
-    ./test.sh $title &
+    ./test.sh $title "$AIKEN" &
     TESTS+=("$title,$lang,$!")
     cd - 1>/dev/null
   done