Expose CLI commands to JS api

[kedrzu]

Is your feature request related to a problem? Please describe.

Sometimes there is a need to use CLI command in a JS script, for example, in a custom CI pipeline.
Currently, we have to do it with running the CLI as a child process (ie. using execa). We even do it in our own code to retrieve stack output (check this https://github.com/webiny/webiny-js/blob/next/packages/cli-plugin-deploy-pulumi/utils/getStackOutput.js#L14).

Describe the solution you'd like.

We should have all of our CLI commands inside our packages to be used programmatically. CLI should be merely a wrapper to access these commands from a terminal.

Describe alternatives you've considered.

No response

[webiny-bot]

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