Improve dynamic vault

[krassowski]

• allow access to nested objects via dynamic vault
• allow setting default importer
• show import info for dynamic vault

[codecov-commenter]

Codecov Report

Base: 93.57% // Head: 92.67% // Decreases project coverage by -0.89% ⚠️

Coverage data is based on head (1c2f884) compared to base (702edd8).
Patch coverage: 85.41% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   93.57%   92.67%   -0.90%     
==========================================
  Files          10       10              
  Lines         591      614      +23     
==========================================
+ Hits          553      569      +16     
- Misses         38       45       +7     

Impacted Files	Coverage Δ
data_vault/dynamic_vault.py	75.00% <65.00%> (-11.96%)	⬇️
data_vault/__init__.py	98.48% <100.00%> (-0.20%)	⬇️
data_vault/action.py	99.12% <100.00%> (+0.14%)	⬆️
data_vault/actions.py	95.00% <100.00%> (ø)
data_vault/vault.py	88.88% <100.00%> (ø)

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