Issue #3562631: Add PHP attribute support to SchemaPropertyType plugins

Elena Chechulinarequested to merge
issue/schema_metatag-3562631:3562631-convert-plugin-types into 8.x-2.x

Issue #3562631: Add PHP attribute support to SchemaPropertyType plugins. Create the SchemaPropertyType PHP attribute class, update the plugin manager to discover plugins via both attributes and annotations (keeping backward compatibility), and add #[SchemaPropertyType(...)] attributes to all 43 PropertyType plugins.

Closes #3562631

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