Expose getting and clearing attributes from the ledger

[mirgee]

Expose functions getting and clearing value of the latest attribute transaction for the specified did through the node wrapper API.

[codecov-commenter]

Codecov Report

Merging #767 (d24997f) into main (699bffd) will increase coverage by 0.02%.
The diff coverage is 77.61%.

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
+ Coverage   54.56%   54.58%   +0.02%     
==========================================
  Files         380      380              
  Lines       36673    36740      +67     
  Branches     8059     8095      +36     
==========================================
+ Hits        20009    20054      +45     
- Misses      10711    10715       +4     
- Partials     5953     5971      +18     

Flag	Coverage Δ
unittests-aries-vcx	54.47% <77.61%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
aries_vcx/src/common/ledger/transactions.rs	62.62% <64.28%> (+0.08%)	⬆️
aries_vcx/tests/test_pool.rs	81.04% <81.13%> (+0.04%)	⬆️
libvdrtools/src/services/pool/request_handler.rs	44.76% <0.00%> (-0.51%)	⬇️
libvdrtools/src/controllers/non_secrets.rs	47.54% <0.00%> (-0.50%)	⬇️
libvdrtools/src/services/pool/mod.rs	52.09% <0.00%> (-0.39%)	⬇️
aries_vcx/src/common/proofs/proof_request.rs	67.72% <0.00%> (-0.21%)	⬇️
libvdrtools/src/services/pool/pool.rs	47.48% <0.00%> (-0.20%)	⬇️
...vcx/src/protocols/issuance/issuer/state_machine.rs	71.08% <0.00%> (-0.12%)	⬇️
libvdrtools/src/services/pool/networker.rs	75.10% <0.00%> (+0.10%)	⬆️

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