feat: ability to hook into cap commands

[buschtoens]

Feature Request

Description

Enable users to hook into any cap command to run before and after hooks. This is useful, e.g. to allow users to run custom scripts when running cap sync.

Preferred Solution

.ts file

Allow users to add a .ts file in the project root that contains hooks.

capacitor.config.ts

As the capacitor.config.json will be generated on-the-fly in Capacitor 3, we could also export the hooks here to avoid adding another file.

package.json scripts

Check the scripts defined in the package.json. Scripts named cap:${command}:(before|after) are executed, e.g. cap:copy:before.

[EinfachHans]

As long as my PR #4536 isn't merged this would be awesome for me, otherwise i can't use AppFlow 😕

[EinfachHans]

I created a PR: #4739

[ionitron-bot]

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