test: replace Jest with Vitest

[targos]

Highlights:

• Update all dependencies.
• Use Vitest instead of Jest and adapt config.
• Make the default package type "module".
  • A CommonJS build is still done, but is now the secondary one.
• Update tsconfig to be more modern and ESM-first.
• Avoid circular dependencies by importing from deeper than src/index.ts internally.
• Use ts-pattern instead of switch statements.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (928b6e7) to head (e705f83).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #317      +/-   ##
==========================================
- Coverage   98.59%   98.48%   -0.12%     
==========================================
  Files         245      243       -2     
  Lines        6280    10016    +3736     
  Branches     1327     2144     +817     
==========================================
+ Hits         6192     9864    +3672     
- Misses         85      152      +67     
+ Partials        3        0       -3     

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[stropitek]

Some directories and files are now part of the coverage but shouldn't. Maybe some stuff in demo / scripts that should be moved to src? Otherwise LGTM.

[targos]

I'll wait for #480 to avoid conflicts in it.