feat: add picasso commands

[MaferMazu]

Description

This PR adds all the necessary files from tutor-contrib-edunext-distro to make the build functionalities.
The functionalities added:

# Validate the syntax and settings are properly set
tutor picasso syntax-validator

# Validate the repositories for packages are valid
tutor picasso repository-validator

# Enable themes
tutor picasso enable-themes

# Enable private packages
tutor picasso enable-private-packages

# Run Tutor commands
tutor picasso run-extra-commands

How to test

Set the env:

1. Create a tvm project or an env with Tutor >= v18.0.0 (Redwood)
2. Intall this plugin pip install git+https://github.com/eduNEXT/tutor-contrib-picasso.git@mfmz/add-picasso-commands
3. Run tutor plugins enable picasso and tutor config save

Start your tests:

• Run tutor picasso -h to have a list of the commands available.
• An easy way to test the other commands is adding in the config.yml

PICASSO_EOX_MANAGE_DPKG:
  index: git
  name: eox-manage
  repo: eox-manage
  domain: github.com
  path: eduNEXT
  protocol: ssh
  private: true
  variables:
    development: {}
    production: {}
  version: v5.2.0
PICASSO_THEMES:
- domain: github.com
  name: ednx-saas-themes
  path: eduNEXT
  protocol: ssh
  repo: ednx-saas-themes
  version: edunext/redwood.master
PICASSO_THEMES_NAME:
- bragi
- css-runtime
PICASSO_THEMES_ROOT: /openedx/themes
PICASSO_THEME_DIRS:
- /openedx/themes/ednx-saas-themes/edx-platform
- /openedx/themes/ednx-saas-themes/edx-platform/bragi-generator
- /openedx/themes/ednx-saas-themes/edx-platform/bragi-children
PICASSO_EXTRA_COMMANDS:
- tutor plugins index add https://raw.githubusercontent.com/eduNEXT/tutor-plugin-indexes/main/
- tutor plugins install mfe mfe_extensions sentry aspects
- tutor plugins enable mfe mfe_extensions sentry aspects python-requirements
- tutor picasso enable-themes
- tutor picasso enable-private-packages
- tutor config save

• Run tutor picasso repository-validator, expected result, no output.
• Run tutor picasso syntax-validator, expected result, Success validation message.
• Run tutor picasso run-extra-commands, expected result, installation of several tutor plugins and two picasso commands.
  • To verify themes, the expected result is to have a directory like this: env/build/openedx/themes/ednx-saas-themes in your env.
  • To verify private packages, you should have your private requirement cloned, like env/build/openedx/requirements/eox-manage, and in env/build/openedx/Dockerfile, you should have a line with the mount info of your plugin (Ctrl+F eox-manage).
  • To verify other extra commands, run tutor plugins list; you should be able to see all the plugins installed.
• To review the readme https://github.com/eduNEXT/tutor-contrib-picasso/tree/mfmz/add-picasso-commands

Next steps

• Using this to build images in Picasso
• When this is merged, we need other branches to have v17 (quince), v16 (palm), v15 (olmo)

[MaferMazu]

As we merged #2. This PR is no longer needed.