[CLI] Extract Blueprints v1-specific parts into BlueprintsV1Handler

[adamziel]

Motivation for the change, related issues

This PR sets the stage for integrating Blueprints v2. All the Blueprints v1-specific parts are moved to a new class called BlueprintsV1Handler. This opens the door to implementing BlueprintsV2Handler.

A part of #2223

Implementation details

This PR mostly moves code around. The only other significant change is kebab-casing CLI args while still supporting camel case notation via hidden yargs arguments.

Testing Instructions (or ideally a Blueprint)

• CI
• Run a few CLI commands and confirm they still work, e.g.

PHP=7.4 node --experimental-wasm-jspi --stack-trace-limit=100 --loader=./packages/meta/src/node-es-module-loader/loader.mts ./packages/playground/cli/src/cli.ts server --wp=6.8 --php=8.4

npx @wp-playground/cli@latest server --mount=.:/wordpress/wp-content/plugins/MY-PLUGIN-DIRECTORY

npx @wp-playground/cli@latest server --blueprint=my-blueprint.json

And a few others from https://wordpress.github.io/wordpress-playground/developers/local-development/wp-playground-cli

[adamziel]

Superseded by #2392