chore: add release script and ci

[hi-ogawa]

This PR adds a minimal release flow for ivya. It roughly follows main vitest repo but simplified. pnpm release directly uses bumpp to bump version, push tag, which then triggers "Publish package" workflow.

Follow-up setup

• Go to GitHub repo settings for vitest-dev/ivya, then Settings -> Environments, and create an environment named Release.
• Go to npmjs.com, open the ivya package, then Settings -> Trusted publishing.
  • Add a trusted publisher with provider GitHub Actions.
  • Fill in owner vitest-dev, repository ivya, workflow filename publish.yml, and environment Release.
• run pnpm release

[pkg-pr-new]

npm i https://pkg.pr.new/ivya@21

commit: a31d05b

[hi-ogawa]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

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