fix: Fix esbuild watch mode

[ArcherGu]

After upgrading esbuild to 0.17.x, the watch option in the BuildOptions did not work. #35

https://github.com/evanw/esbuild/releases/tag/v0.17.0

I fixed this and left a watch option compatible with past versions:

  /**
   * esbuild options
   * 
   * @deprecated `esbuildOptions.watch` is deprecated, use `onRebuild` instead
   */
  esbuildOptions?: BuildOptions & {
    watch?: boolean | {
      onRebuild?: RebuildCallback
    }
  }

We should remove it in some future release.

[github-actions]

🎉 This PR is included in version 4.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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