chore: move to vitest

[westeezy]

Tasks:

Update Node setup

• turn off save=false in .npmrc to avoid annoyances
• add .nvmrc and point to v16

Migrate from Karma -> Vitest

• Removed sync-browser-mocks in favor of a simple global stub
• Move tests to vitest runner
• Colocate test in /src/__tests__

Move Diagrams to Mermaid

• Moving diagrams from images to mermaid for easier editing later

Update License

• Match Apache 2 License we use elsewhere

[westeezy]

@jamischarles you got me thinking about beaver-logger more so making some updates. Overall plan is to increase test coverage + modernize. We should chat some more soon.

cc @sioked

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.23%. Comparing base (4b988e0) to head (5e61b41).
Report is 18 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff             @@
##             main      #72       +/-   ##
===========================================
+ Coverage   73.82%   87.23%   +13.40%     
===========================================
  Files           5        6        +1     
  Lines         149      564      +415     
===========================================
+ Hits          110      492      +382     
- Misses         39       72       +33     

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[jamischarles]

Looks great! Thx @westeezy for bringing the heathens the gospel of vitest.