Support for multiple commands in version script

[RomanHotsiy]

I'll update docs and add some more error handling if you are open to accept this PR in general.

The use case for this is to run pnpm install after changeset version

[changeset-bot]

⚠️ No Changeset found

Latest commit: 49a6c09

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[Techn1x]

I also needed this behaviour, I suspect the intent is that pnpm changeset version should make the necessary changes, but it does not seem to.

I got around the 1 command limitation it by adding this to my package.json scripts

"scripts: {
  "version": "changeset version && pnpm install --no-frozen-lockfile",`
}

and then setting the version arg for this action like this
version: pnpm run version