Refactor test setup, add interface to write DIDs on ledger

[Patrik-Stas]

• Add interface to write endorser DIDs on Indy ledger write_endorser_did
• In order to reasonably implement its test test_pool_write_new_endorser_did I have refactored code related to test setup - mainly separating building "Profiles" from building and setting up wallet. This the mentioned test to create one instance of "Faber agent" with known trusteee DID, and one instance of "Faber agent" with a random did in its wallet.
• Change libvcx function wallet_create_pairwise_did to wallet_create_and_store_did(seed: Option<&str>) - the original name is bit deceiving, sometimes you just want to generate a key even when and you are not dealing with any pairwise relationship. So this name is more general and also provide option to pass in seed for did/verkey generation.
• Minor CI improvements - making needs declaration bit simpler and consistent
• Added some integration tests directly to node wrapper, rather than propagating the APIs to vcxagent-core.

[codecov-commenter]

Codecov Report

Merging #921 (7012c06) into main (773113c) will increase coverage by 0.09%.
The diff coverage is 73.42%.

❗ Current head 7012c06 differs from pull request most recent head 2e54125. Consider uploading reports for the commit 2e54125 to get more accurate results

@@            Coverage Diff             @@
##             main     #921      +/-   ##
==========================================
+ Coverage   44.16%   44.25%   +0.09%     
==========================================
  Files         418      418              
  Lines       29253    29311      +58     
  Branches     6234     6262      +28     
==========================================
+ Hits        12920    12973      +53     
+ Misses      12523    12512      -11     
- Partials     3810     3826      +16     

Flag	Coverage Δ
unittests-aries-vcx	44.25% <73.42%> (+0.09%)	⬆️

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

Files Changed	Coverage Δ
aries_vcx/src/utils/constants.rs	0.00% <ø> (ø)
...ries_vcx/src/utils/mockdata/profile/mock_ledger.rs	0.00% <0.00%> (ø)
aries_vcx_core/src/ledger/base_ledger.rs	0.00% <ø> (ø)
aries_vcx_core/src/wallet/base_wallet.rs	0.00% <ø> (ø)
aries_vcx_core/src/wallet/indy/wallet.rs	40.60% <0.00%> (-1.74%)	⬇️
aries_vcx_core/src/ledger/indy_vdr_ledger.rs	35.80% <50.00%> (+2.68%)	⬆️
aries_vcx/src/utils/devsetup.rs	47.36% <62.90%> (-2.00%)	⬇️
aries_vcx/src/common/ledger/transactions.rs	44.93% <76.92%> (+1.94%)	⬆️
aries_vcx/tests/utils/devsetup_alice.rs	73.05% <77.77%> (-1.32%)	⬇️
aries_vcx/tests/utils/devsetup_faber.rs	81.52% <77.77%> (-0.83%)	⬇️
... and 5 more

... and 7 files with indirect coverage changes