feat!: bumping versiong ranges, etc.

[hasundue]

Including a rewrite of @molt/core, aiming at

• Stabilize lockfile updating
• Support updating version ranges
• Simplify the codebase

You may try the snapshot with @molt/cli@^0.19.0-rc.0

Will release 0.19.0 once documentation is done.

[codecov]

Codecov Report

Attention: Patch coverage is 93.01775% with 59 lines in your changes missing coverage. Please review.

Project coverage is 89.17%. Comparing base (dfe3168) to head (ea16eda).

Files	Patch %	Lines
core/mod.ts	90.10%	18 Missing ⚠️
core/refs.ts	85.84%	16 Missing ⚠️
core/locks.ts	96.82%	7 Missing and 1 partial ⚠️
lib/constraints.ts	90.78%	7 Missing ⚠️
core/bumps.ts	81.81%	3 Missing and 1 partial ⚠️
core/internal.ts	75.00%	3 Missing ⚠️
core/updates.ts	96.77%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #196       +/-   ##
===========================================
+ Coverage   76.79%   89.17%   +12.37%     
===========================================
  Files          10       13        +3     
  Lines        1198     1090      -108     
  Branches      186      133       -53     
===========================================
+ Hits          920      972       +52     
+ Misses        272      116      -156     
+ Partials        6        2        -4     

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