feat: add FillID() method for vaults

[randmonkey]

Add FillID method for Vault. Fixes #390.

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (896a8a3) 53.02% compared to head (af90dd4) 53.04%.

Files	Patch %	Lines
kong/ids.go	58.82%	5 Missing and 2 partials ⚠️
kong/vault.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   53.02%   53.04%   +0.01%     
==========================================
  Files          69       69              
  Lines        5226     5243      +17     
==========================================
+ Hits         2771     2781      +10     
- Misses       1871     1876       +5     
- Partials      584      586       +2     

Flag	Coverage Δ
2.1	33.14% <45.45%> (+0.08%)	⬆️
2.2	44.53% <45.45%> (+0.04%)	⬆️
2.3	45.24% <45.45%> (+0.04%)	⬆️
2.4	45.31% <45.45%> (+0.04%)	⬆️
2.5	45.31% <45.45%> (+0.04%)	⬆️
2.6	45.31% <45.45%> (+0.04%)	⬆️
2.7	46.80% <45.45%> (+0.03%)	⬆️
2.8	46.80% <45.45%> (+0.03%)	⬆️
3.0	50.50% <45.45%> (+0.02%)	⬆️
3.1	51.95% <45.45%> (+0.02%)	⬆️
3.2	52.01% <45.45%> (+0.02%)	⬆️
3.3	52.01% <45.45%> (+0.02%)	⬆️
3.4	52.33% <45.45%> (+0.02%)	⬆️
community	38.33% <45.45%> (+0.06%)	⬆️
enterprise	51.72% <45.45%> (+0.02%)	⬆️
enterprise-nightly	50.69% <45.45%> (+0.02%)	⬆️
integration	53.04% <45.45%> (+0.01%)	⬆️
nightly	37.63% <45.45%> (+0.06%)	⬆️

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