refactor: improve record category type, closes #1112

[xprazak2]

Replace a string type with enum.

[codecov-commenter]

Codecov Report

Attention: 86 lines in your changes are missing coverage. Please review.

Comparison is base (cb28bad) 0.05% compared to head (cb8ae01) 0.05%.

Files	Patch %	Lines
...vcx_core/src/wallet/base_wallet/record_category.rs	0.00%	36 Missing ⚠️
...ies_vcx_core/src/wallet/indy/indy_record_wallet.rs	0.00%	13 Missing ⚠️
...es/misc/wallet_migrator/src/vdrtools2credx/conv.rs	0.00%	12 Missing ⚠️
aries/aries_vcx_core/src/wallet/indy/mod.rs	0.00%	7 Missing ⚠️
aries/misc/test_utils/src/mock_wallet.rs	0.00%	6 Missing ⚠️
...ries_vcx_core/src/anoncreds/credx_anoncreds/mod.rs	0.00%	5 Missing ⚠️
.../aries_vcx_core/src/wallet/agency_client_wallet.rs	0.00%	5 Missing ⚠️
...es/aries_vcx_core/src/wallet/base_wallet/record.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1123      +/-   ##
========================================
- Coverage   0.05%   0.05%   -0.01%     
========================================
  Files        497     498       +1     
  Lines      25298   25339      +41     
  Branches    4597    4613      +16     
========================================
  Hits          13      13              
- Misses     25285   25326      +41     

Flag	Coverage Δ
unittests-aries-vcx	0.05% <0.00%> (-0.01%)	⬇️

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