Feature/cred migrator

[bobozaur]

This PR introduces the wallet_migrator library crate, currently just for the purpose of migrating anoncreds related objects from their libvdrtools implementation to indy-credx. This is accomplished by creating a new Indy wallet, so the old one remains as a backup.

The migrator is flexible enough though to support migrating anything in terms of an Indy wallet.

In the future the crate could be extended to assist with migrating from an Indy wallet to a different one too.

The PR also adds a testing feature (unfortunately necessary) to accommodate current tests in aries-vcx so that wallets get migrated in the middle of the tests to ensure things keep working post migration.

Stubs are already in place for the indy-credx to anoncreds-rs migration, but that will be fully implemented in a future PR.

[codecov-commenter]

Codecov Report

Merging #867 (036747d) into main (c49c1ab) will decrease coverage by 41.78%.
The diff coverage is 0.64%.

@@            Coverage Diff             @@
##             main    #867       +/-   ##
==========================================
- Coverage   49.89%   8.12%   -41.78%     
==========================================
  Files         432     434        +2     
  Lines       35058   34783      -275     
  Branches     7617    7538       -79     
==========================================
- Hits        17493    2826    -14667     
- Misses      12287   31156    +18869     
+ Partials     5278     801     -4477     

Flag	Coverage Δ
unittests-aries-vcx	8.12% <0.64%> (-41.74%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
agency_client/src/agency_client.rs	0.00% <0.00%> (-76.70%)	⬇️
aries_vcx/src/core/profile/vdrtools_profile.rs	35.00% <0.00%> (-37.50%)	⬇️
aries_vcx/src/utils/devsetup.rs	33.18% <0.00%> (-31.70%)	⬇️
aries_vcx/tests/test_creds_proofs.rs	0.08% <0.00%> (-88.00%)	⬇️
aries_vcx/tests/test_creds_proofs_revocations.rs	0.13% <0.00%> (-87.73%)	⬇️
aries_vcx/tests/test_mysql_wallet.rs	3.03% <0.00%> (-78.61%)	⬇️
aries_vcx/tests/utils/devsetup_agent.rs	0.00% <0.00%> (-76.62%)	⬇️
aries_vcx/tests/utils/scenarios.rs	0.00% <0.00%> (-83.88%)	⬇️
aries_vcx_core/src/anoncreds/credx_anoncreds.rs	0.00% <0.00%> (-56.49%)	⬇️
aries_vcx_core/src/wallet/indy_wallet.rs	2.85% <0.00%> (-52.39%)	⬇️
... and 21 more

... and 297 files with indirect coverage changes

[Patrik-Stas]

left few comments

I'd suggest to work a little bit more on testing - the current approach includes migration to existing tests, but usually the migration happens at the same spot, after issuing credentials.
We could probably take some tests and tweak around the position of migration, but I think following scenario could deserve a dedicated test:

Scenario 1:

• create creddef, revocation registry
• issue credential A, revoke locally
• issue credential B
• migrate
• revoke locally B
• issue another credential C
• revoke locally C
• publish revocation

Mainly to check that revocation registries and accumulated deltas properly survive across the migration

[bobozaur]

@Patrik-Stas The requested test scenario was added. I'll be monitoring the CI to check on the latest changes, but apart from that I think the points you mentioned in your review are covered now.

[Patrik-Stas]

left some comments

[Patrik-Stas]

left further comment on logging