Show confirmation before clearing table

[arcataroger]

This shows a simple modal when the Clear button is pushed:

Fixes #101

Demo

https://github.com/datocms/plugins/assets/11964962/3f83d167-11cd-49cd-bd96-5b3fb8080198

[arcataroger]

@sistrall Is the correct procedure here for me to:

• Merge it
• npm publish it with the next tag
• Test it in a test project by upgrading to the canary release
• If it looks good, then npm publish it for real?

(From https://www.datocms.com/docs/plugin-sdk/releasing-new-plugin-versions)

Just making sure :) Thanks for reviewing this!

[arcataroger]

@sistrall Sorry, I don't have NPM permissions to that repo! Could you add me, please, or publish it for me?

https://www.npmjs.com/package/datocms-plugin-table-editor