introduce npm test

[shogo82148]

Summary by CodeRabbit

• Chores

  • Updated gitignore to exclude /npm/ and /coverage/ directories.
  • Added a workflow for running tests on multiple Node.js versions.
  • Enhanced Deno configuration with an import mapping for @deno/dnt.

• New Features

  • Introduced a script to build a Deno module for npm distribution.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.62%. Comparing base (aef57e5) to head (9165c44).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3 +/- ## ======================================= Coverage 96.62% 96.62% ======================================= Files 1 1 Lines 267 267 Branches 74 74 ======================================= Hits 258 258 Misses 9 9 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[coderabbitai[bot]]

Walkthrough

The recent changes introduce a comprehensive CI/CD setup for Node.js using GitHub Actions, incorporating Node.js versions 22.x, 20.x, and 18.x for testing. They enhance the deno.json configuration for building npm packages, include new ignore rules in .gitignore, and add a script to facilitate building Deno modules for npm distribution.

Changes

Files	Summary
.github/workflows/test.yaml	Added a CI job with a matrix strategy for multiple Node.js versions, setup steps for Node.js, Deno, and npm testing.
.gitignore	Added /npm/ directory and /coverage/ directory to the ignore list.
deno.json	Introduced import mapping for @deno/dnt to the configuration.
scripts/build_npm.ts	Created a script to build a Deno module for npm distribution including various build tasks.

Poem

In the land of code, green ticks arise,
The CI hums with Node's wise eyes,
Deno dances with npm's charm,
New builds crafted, free from harm,
Ignored paths and modules blend,
To testing's end, no corners bend.
🐇✨

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