Refactor aries_vcx_core

[Patrik-Stas]

• Small vdrtools adjustment to make indy-wallet compilable without zmq dependency (original intention of PR was to extract wallet out of vdrtools, a strategy I decided to abandon, so this dependency/feature changed in vdrtools are here just as "why not" improvement)
• Reorganize files in aries_vcx_core such that all wallet APIs are under aries_vcx_core/wallet module
• Reorganize aries_vcx_core to move files out of src/indy into src/anoncreds / src/ledger / src/wallet to keep things together. Previously things been a bit scatter in src/indy and other directories.

[codecov-commenter]

Codecov Report

Merging #910 (682a93b) into main (b49b5d9) will decrease coverage by 0.03%.
The diff coverage is 33.09%.

@@            Coverage Diff             @@
##             main     #910      +/-   ##
==========================================
- Coverage   43.37%   43.34%   -0.03%     
==========================================
  Files         438      438              
  Lines       34777    34847      +70     
  Branches     7580     7606      +26     
==========================================
+ Hits        15084    15106      +22     
- Misses      15231    15259      +28     
- Partials     4462     4482      +20     

Flag	Coverage Δ
unittests-aries-vcx	43.34% <33.09%> (-0.03%)	⬇️

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

Files Changed	Coverage Δ
aries_vcx/src/common/anoncreds.rs	80.30% <ø> (ø)
aries_vcx/src/common/keys.rs	44.64% <ø> (ø)
...vcx/src/common/primitives/credential_definition.rs	55.84% <ø> (ø)
aries_vcx/src/common/primitives/mod.rs	83.49% <ø> (ø)
...es_vcx/src/common/proofs/prover/prover_internal.rs	27.27% <ø> (ø)
aries_vcx/src/common/test_utils.rs	93.54% <ø> (ø)
aries_vcx/src/core/profile/vdrtools_profile.rs	72.50% <ø> (ø)
aries_vcx/src/handlers/connection/cloud_agent.rs	70.00% <ø> (ø)
aries_vcx/src/utils/provision.rs	77.77% <ø> (ø)
aries_vcx/tests/test_agency.rs	77.60% <ø> (ø)
... and 33 more

... and 6 files with indirect coverage changes