Refactor features, enable build with --no-default-features

[Patrik-Stas]

At high level, this re-enables building aries-vcx, aries-vcx-core without any features enabled. Comes along with some refactoring to make sense of things and prepare ground for gradual removal of vdrtools based components.

• aries-vcx-core: define more granular features - this will come handy in subsequent PR's removing parts of vdrtools vdrtools_anoncreds, vdrtools_wallet, vdrtools_ledger
• move non-indy specific files out of indy directories (eg ToBaseAgencyClientWallet moved from aries_vcx_core::wallet::indy::agency_client_wallet to aries_vcx_core::wallet::agency_client_wallet
• aries-vcx-core: include indy-api-types as dependency to access indy_api_types::errors directly to simplify error mapping (aries_vcx_core/src/errors/mapping_vdrtools.rs )
• remove support for vdrtools based ledger client from did_resolver_sov - it was causing some complications which won't be relevant as soon as this Replace vdrtool ledger client by indy-vdr client #914 get merged

[codecov-commenter]

Codecov Report

Merging #918 (db372ee) into main (29cde27) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #918      +/-   ##
==========================================
- Coverage   43.34%   43.34%   -0.01%     
==========================================
  Files         438      438              
  Lines       34847    34847              
  Branches     7606     7604       -2     
==========================================
- Hits        15104    15103       -1     
  Misses      15262    15262              
- Partials     4481     4482       +1     

Flag	Coverage Δ
unittests-aries-vcx	43.34% <ø> (-0.01%)	⬇️

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

Files Changed	Coverage Δ
aries_vcx/src/handlers/connection/cloud_agent.rs	70.00% <ø> (ø)
aries_vcx/src/protocols/connection/generic/mod.rs	0.00% <ø> (ø)
...ies_vcx/src/utils/mockdata/profile/mock_profile.rs	0.00% <ø> (ø)
aries_vcx/src/utils/mod.rs	50.00% <ø> (ø)
aries_vcx/src/utils/provision.rs	77.77% <ø> (ø)
aries_vcx/tests/test_agency.rs	77.60% <ø> (ø)
...ries_vcx_core/src/errors/mapping_indy_api_types.rs	32.35% <ø> (ø)
aries_vcx_core/src/ledger/mod.rs	0.00% <ø> (ø)
aries_vcx_core/src/wallet/agency_client_wallet.rs	17.47% <ø> (ø)
aries_vcx_core/src/wallet/base_wallet.rs	0.00% <ø> (ø)
... and 5 more

... and 1 file with indirect coverage changes