The only way to effectively share any software across macOS platforms is to sign and notarize it. If you don’t Apple will treat it as a security threat. On top of this, you will also need to make sure the end user has Csound installed. Otherwise you will need to include a relinked build of Csound in your plugin bundle.
https://forum.cabbageaudio.com/t/distributing-plugins-on-macos-part-1/2274
Note some of the info posted in that link is already out of date, but teh relinking script should still work. This is also a good guide about signing plugins: