Implement more plugin management subcommands

[sagikimhi]

• It should be possible to enable and disable plugins by running a command such as socx plugin enable/disable/toggle

• It should be possible to list plugins by running socx plugins list

• it should be possible to add a plugin interactively through a command such as socx plugin add with no arguments

• it should be possible to import plugins from any other local socx project containing a .socx.yaml configuration file by running a command such as socx plugin import <project-root-path> <plugin-name-or-pattern> [plugin-name-or-pattern] ..., it should also be fairly simple to implement simply by copying the project's plugin configurations of any plugin name that matches the passed argument names/globs and write/append it to the current project's plugin configurations

• it should be possible to remove a plugin entirely from project configuration by running a command such as socx plugin remove <plugin-name>