Prune cardano transactions in signer after block range roots computation

[Alenar]

Content

This PR add, to the signer only, a pruning of the cardano transactions after the computation of block ranges roots.

This is done using a decorator wrapping the existing CardanoTransactionsImporter.

Two new configuration parameters have been added to signer Configuration structure:

• network_security_parameter, default to 2160 (mainnet value).
• enable_transaction_pruning, default to true.

Since both have a default value our signer won't have to update their configurations.

Pre-submit checklist

• Branch
  • [x] Tests are provided (if possible)
  • [x] Crates versions are updated (if relevant)
  • [x] CHANGELOG file is updated (if relevant)
  • [x] Commit sequence broadly makes sense
  • [x] Key commits have useful messages
• PR
  • [x] No clippy warnings in the CI
  • [x] Self-reviewed the diff
  • [x] Useful pull request description
  • [x] Reviewer requested
• Documentation
  • [ ] Update README file (if relevant)
  • [ ] Update documentation website (if relevant)
  • [ ] Add dev blog post (if relevant)

Comments

• As it was the third time that we needed to do a simple query to retrieve a single result from database, a system using a extension trait on the sqlite connection has been added to do that simply with reduced boilerplate.
• Some simplification has been done on the configuration system: a leaner way to hydrate default configuration (mithril-signer & mithril-aggregator) and generalized use of the test configuration values (new_sample(party_id), mithril-signer).

Issue(s)

Closes #1645

[github-actions[bot]]

Test Results

    3 files  ± 0     43 suites  ±0   8m 32s :stopwatch: ±0s   970 tests +11    970 :white_check_mark: +11  0 :zzz: ±0  0 :x: ±0  1 064 runs  +11  1 064 :white_check_mark: +11  0 :zzz: ±0  0 :x: ±0 

Results for commit e258352b. ± Comparison against base commit 2fe74c2a.

:recycle: This comment has been updated with latest results.