Add logic for block style entry points

[dmtrmrv]

Related Issue/RFC: #339

This PR introduces several enhancements and fixes to the configuration and entry logic for the toolkit package. Key changes include the reorganization of path configurations, the addition of a new configuration option for loading block-specific styles, and the update of the webpack entry to support this new feature.

Changes

1. Path Configuration Updates (paths.config.js):

   • Reorganized and added a new path configuration for blocksStyles.
   • Maintained the order of properties for better readability and consistency.

2. Webpack Entry Updates (entry.js):

   • Introduced a new configuration option loadBlockSpecificStyles to conditionally load CSS files specific to blocks.
   • Implemented logic to automatically discover and create entry points for block-specific stylesheets located in the assets/css/blocks directory.
   • Merged the new entry points for block stylesheets with the existing build files.

3. Default Configuration Update (config.js):

   • Added the loadBlockSpecificStyles option to the default configuration, with a default value set to false.

Requires this to be deployed to Scaffold: 10up/wp-scaffold#229

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.
• I have added a changeset to my PR. See CONTRIBUTING document for instructions

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[nicholasio]

@dmtrmrv Would you mind try adding a few e2e tests? You can follow the structure of the existing e2e tests, essentially you can create a new "project" with an expected block structure, run tooklit via jest then asset that toolkit is compiling the right files.