Search Package: Add watch command

[jsnmoon]

Changes proposed in this Pull Request:

• Adds a watch command to package.json.
• Adds a watch command to composer.json

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• Run pnpm install && pnpm run watch. Ensure it builds the requisite assets as expected.
• Run pnpx jetpack watch packages/search. Ensure it executes the same command as above.

[github-actions]

Thank you for your PR!

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• ✅ Add changelog entries to affected projects
  

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Jetpack plugin:

• Next scheduled release: February 1, 2022.
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[oskosk]

@jsnmoon Check the commands you're prompted to run on the File changes view... You've mentiond this is a minor change in the changelog file and thus the system is asking you to bump versions. So :

$ tools/fixup-project-versions.sh
$ git comit.....

[jeherve]

You'll need to update versions here before we can merge this.

[jsnmoon]

@oskosk @jeherve: I somehow missed the outdated version notice; thank you for the heads up! This has now been fixed.

[bluefuton]

Thanks for adding this @jsnmoon! I'll update the internal docs.