add signable builder in signer

[ghubertpalo]

Content

This PR includes add SignableBuilder in the Signer binary.

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
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Comments

Implementation done, not yet used by the runner system.

Issue(s)

Relates to #852

[github-actions]

Test Results

    3 files  ±0    30 suites  ±0   6m 11s ⏱️ +57s
565 tests ±0  565 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
641 runs  ±0  641 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 79a4128. ± Comparison against base commit 0173a98.

This pull request removes 1 and adds 1 tests. Note that renamed tests count towards both.

signable_builder::immutable_signable_builder::tests ‑ compute_signable

signable_builder::cardano_immutable_full_signable_builder::tests ‑ compute_signable

♻️ This comment has been updated with latest results.

[jpraynaud]

Maybe we should stick to the nomenclature given by the signed entity types for clarity, and rename to CardanoImmutableFilesFullSignableBuilder?

[jpraynaud]

LGTM 👍