feat(mod)!: per-dependency update of lockfile

[hasundue]

• refactor(lib/update): flatten code around cache
• feat!: per-dependency updating of a lockfile

[codecov]

Codecov Report

Attention: Patch coverage is 88.68613% with 62 lines in your changes are missing coverage. Please review.

Project coverage is 89.09%. Comparing base (156fbf1) to head (1b3353b).

Files	Patch %	Lines
lib/file.ts	82.52%	18 Missing ⚠️
lib/update.ts	91.89%	14 Missing and 1 partial ⚠️
lib/lockfile.ts	89.16%	13 Missing ⚠️
lib/dependency.ts	63.63%	8 Missing ⚠️
lib/graph.ts	91.11%	4 Missing ⚠️
lib/testing.ts	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   87.40%   89.09%   +1.69%     
==========================================
  Files          18       20       +2     
  Lines         913     1238     +325     
  Branches      146      198      +52     
==========================================
+ Hits          798     1103     +305     
- Misses        115      134      +19     
- Partials        0        1       +1     

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