Option to delete sourcemaps after upload

[valerio]

I've been using create-react-app to deploy with Netlify and this plugin has been very helpful in setting up the integration.

The problem I run into is that my sourcemaps get also deployed on Netlify and the full source is visible when opening the inspector.
I'd normally output sourcemaps in a separate directory from the one being deployed, but create-react-app doesn't give me that option without ejecting and having to manage a custom webpack config.

Would an option to delete sourcemaps after deployment be something worth adding to this plugin?
Happy to contribute the change if it's ok.

[carchrae]

if you'd like to use my PR (in case it is not merged) you can copy the plugin code into your project (you will need to copy all of the files into ./netlify-plugins/sentry-netlify-build-plugin/ to use the config below)

netlify.toml:

[[plugins]]
package = "/netlify-plugins/sentry-netlify-build-plugin/"
   [plugins.inputs]
     sentryDeleteSourceMaps = true

i have tested this on my own project and it worked for me.