chore: moved theme plugins into monorepo

[lizschwab]

The basics

• I validated my changes

The details

Resolves

Fixes #7762

Proposed Changes

• Moved the theme plugins over to the monorepo
• Updated dependency versions so that any blockly packages currently in the monorepo are pointing to the current version
• Updated the exports in the blockly package to be friendly with local development
• Updated the gulp pack task to update the exports for package use
• Added the linting and formatting rules for theme plugins to the monorepo rule lists
• Updated the build task to include packing blockly so that themes can consume it in their build tasks

Reason for Changes

This is part of our ongoing monorepo project.

Test Coverage

No tests were added for this. I tested this locally by doing the following:

• Cleaning out all node_modules, dist, build, and package-lock.json directories/files
• Running npm install from the monorepo root
• Running npm run build from the monorepo root
• Running npm run lint from the monorepo root
• Running npm run test from the monorepo root
• Running npm run format:check from the monorepo root
• Running npm run start from each package root
• Visually confirming the packages/blockly/dist/package.json looks correct after running npm run package from the blockly package

Documentation

Documentation will be handled as part of a future task.