Feature : Add support for building blocks in theme

[nani-samireddy]

Description

This PR adds support for building blocks using npm commands, Blocks automatic registration and excluding blocks from registering.

Technical Details

The following commands are added for the blocks and uses wp-scripts internally.

• npm run create:block: To create a new block it accepts all the parameters that @wordpress/create-block take.
• npm run build:blocks: To generate the build files for blocks.
• npm run build:block-manifest: To generate the blocks-manifest.php file at /assets/build/blocks/blocks-manifest.php This will be used to register the blocks metadata collection.
• npm run start:blocks: To start the dev server for blocks and will build the blocks whenever any changes are made in the block files.

File structure

• All the blocks will be placed inside the /assets/src/blocks/ folder. Build files for the respective blocks will be in /assets/build/blocks/

Automatic Block Registration

• All the blocks in the assets/build/blocks/ are registered automatically using PHP script.

Excluding blocks

• By default all the blocks are registered. To exclude any block from registering, Update the block folder name with an _ prefix.

Documentation

• All the required documentation about the building blocks support is added in the docs/blocks-guide.md file.

Checklist

• New block can be added with a npm script.
• New blocks are registered automatically.
• Should be able to exclude any block from build or registration.
• Appropriate documentation has been added to /docs

Screenshots

add.building.blocks.support.to.the.theme.mov

To-do

Fixes/Covers issue

#510

[divyarajmasani]

@nani-samireddy check the failing build.

[nani-samireddy]

@divyarajmasani
If there are no blocks available at the given path then the npm run build:block-manifest command will through an error.
In the Workflow when we run the npm run build it runs the npm run build:block-manifest command and no blocks are present in the given path.

[sagarjadhav]

@divyarajmasani Can you please review the PR?