Add Setting for Local Plugin Path

[coderaaron]

This adds a setting (that can only be set in kana.json for now) called localPluginsPath that if type is set to theme will map the directory specified to the plugins directory, allowing you to set the plugins you want/need installed for development of the theme.

It also adds the stub of a setting called localPlugins that will be used like the plugins setting but to install the plugin(s) in the path specified in the localPluginsPath but the setting does nothing currently.

[coderaaron]

example kana.json

{
  "local": false,
  "localplugins": [],
  "localpluginspath": "/Users/aaron.graham/Developer/wp-content/plugins",
  "php": "8.1",
  "plugins": [],
  "type": "theme",
  "xdebug": true
}

[ChrisWiegman]

Thank you, Aaron! I will be reviewing this today or tomorrow! My apologies for being so late on it!

[ChrisWiegman]

I think we're a bit stale on this @coderaaron. Do we want to revisit or should we close the PR?