This is part of the monorepo project.

The theme plugins rarely get updates, so they are a good place to start with pulling plugins into core.

As long as no changes are coming into the theme plugins, we can hold off on RaspberryPiFoundation/blockly-samples#2134 until after this step.

• Copy theme plugins from blockly-samples into blockly
• Update versions to respect locked versioning, and update dependencies to use workspace-style notation
  • @maribethb to add more detail here
• Test that npm install, npm build, and npm test work
  • From the root of the monorepo
  • From inside each plugin's directory