fix: plugin create command needs more args for plugin seed

[rosen-vladimirov]

There are two new prompts in the plugin seed which require new command line options to be passed from CLI. Handle the new prompts and pass the new options. They can be used in automation scripts.
In order to prevent such issue in the future, ensure the spawned process's stdout and stdin are inherited, so if there's a prompt in the plugin seed, CLI will show it to the user.

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/nativescript-cli/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

What is the current behavior?

tns plugin create <pl name> command hangs.

What is the new behavior?

tns plugin create <pl name> command prompts for new params and can be automated with newly introduced command line flags.

Fixes issue #4616