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WASM: Introduce the host functions registry builder

Thomas Letan requested to merge lthms@registry-builder into master

Context

The main motivation for this MR is to prepare the introduction of
per-revision host functions in the WASM PVM.

The newly introduced [builder] type allows to incrementally constructs
a [registry], and share a common base between two registries. This
should makes the use of a ad-hoc [write_debug] implementation less
demanding, performance-wise.

Manually testing the MR

CI shall prevail.

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

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