Add Block Factory

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The Problem

There is a Gutenberg\BlockInterface, and a common way of creating one seems to be by using a map returned by parse_blocks(). Unfortunately, there's nothing right now that could allow the creation of a block from such a map. There's no way at all to abstract block initialization.

Suggested Solution

• Add a BlockFactoryInterface that would accept the key parameters for blocks separately and with proper type declarations.
• Add a ConfigBasedBlockFactoryInterface that would accept an array map of values from one of the items of parse_blocks(). This allows easy creation from configuration, based on WP config key conventions.