Add the raw shape and make an unmapped field visible instead of silent

Problem/Motivation

The decision taken for this module is that every field of a bundle is exposed. A field whose type has no shape is still returned — as the raw value Drupal gives — and is simultaneously recorded as needing a handler. Dropping it instead would lose data silently, and the person affected finds out only when the front end shows nothing.

Proposed resolution

• A raw shape that returns the field values as the typed data API gives them, with anything unserializable removed rather than fataling.
• Every use of it records an entry for the change queue: this bundle, this field, this type, no handler assigned.
• A site switch include_unmapped, default TRUE, that drops unmapped fields from the response for sites that want the narrow shape.
• A blacklist by field name and by pattern, defaulting to the obviously non-public — field_internal_*, field_admin_*, password and token fields — and visible in the UI so that what is hidden is known.

Remaining tasks

Everything.