RPC: respond to request with chunks of data rather than one big blob

Merged as part of !2721 (merged)

Context

The over-arching aim is to allow cooperation points when outputting large json values on the network. (To improve end-user performance for RPC callers.)

The different comnponents are:

• Available in master changes in resto (pinned during build, nomadic-labs/resto!25 (merged))
• Available in master changes in json-data-encoding (pinned during build, nomadic-labs/json-data-encoding!5 (merged))
• Available in master changes in data-encoding (pinned during build, nomadic-labs/data-encoding!19 (merged))
• slightly different glue to plug together the above components in tezos, especially in protocol-environment

Manually testing the MR

Checklist

• N/A Document the interface of any function added or modified (see the coding guidelines)
• Provide automatic testing (see the testing guide).
• Add item in the Development Version section of CHANGES.md (only for new features and bug fixes).

Reviewers

@pirbo @romain.nl