Proto/Michelson: add normalize-types option to code-retrieving RPCs and client commands

Context

Should solves the rest of #2707 (closed), i.e. possibility to see unnormalized types or normalized types in:

• RPC /chains/main/blocks/head/context/contract/ADDRESS
• RPC /chains/main/blocks/head/context/contract/ADDRESS/script/normalized
• command get contract code for

Based on !4876 (merged)

Manually testing the MR

Play with related RPCs and client commands

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR