`BlindPset` and `SignPset` implementation

[louisinger]

This PR is not ready to be merged, two tests do not pass <--- now OK, see UPDATE comment below

• update to latest GDK release (0.55) for psetv2 support
• import a libwally wheel built from the WIP psetv2_merge branch. The whl file is a temporary solution, will be replaced after the libwally psetv2 release.
• use wally.psbt_blind to implement TransactionService.blind_pset method.
• use gdk.psbt_sign to implement TransactionService.sign_pset method.
• use wally.psbt_init to implement TransactionService.create_empty_pset.

domain refactoring

• gather and simplify gdk_wallet.py + gdk_account.py into gdk.py file.
• move Locker instanciation outside of application layer (= remove async behavior from create/login methods).
• repository pattern handling the pin_data.json

signing errros

About testing: the tests are launched on the testnet network in order to use the AMP assets. make test runs the tests. Only test_transaction_service.py is failing, other test files are OK. Both failing tests are skipped, u need to comment the @pytest.mark.skip line to run it.

• test_send_pset tries to send some blinded L-BTC from an address to another one. the test creates, blinds and signs the pset. It fails at gdk.psbt_sign with "The tx failed the testmempoolaccept call with the node" error.
• test_send_amp_confidential_pset tries to send some AMP asset from an address to another one. To pay the L-BTC fees, another account "fees" selects and signs an L-BTC input. It fails at gdk.psbt_sign step "Tx contains unauthorized asset" -> not supported yet by GDK.

grpc handlers not done

• gdk-ocean needs update to ocean protos v1: related to https://github.com/vulpemventures/gdk-ocean/issues/6. Done in another PR.
• only application services are done on this branch (ocean protos v1alpha currently)

it closes #2 it closes #3 it closes #6

@altafan please review

[louisinger]

UPDATE: cc/ @altafan @tiero

Latest commits fix all the application layer and update to latest ocean stubs (no more submodule) + implement the grpc handlers. Those handlers has been testnet only manually with cli.py -> we should test in a real case before merging that PR in my opinion.

The branch is also bumping to gdk 0.56

It also removes the TEST_MNEMONIC hardcoded in tests file (now you need to set up a TESTNET_TEST_MNEMONIC env var locally, note that there is a support for .env files) -> the idea is to set up that variable via GH secret. Please send me private message if you want the test mnemonic.

add a ci.yml running the tests.

[tiero]

add a ci.yml running the tests.

make separate PR for for ci.yml and we merge that first, so this PR can run

[tiero]

add a ci.yml running the tests.

make separate PR for for ci.yml and we merge that first, so this PR can run

You can merge from master now, it shoudl trigger CI

[tiero]

CI is failing on make env?