Provide views field handler to access project properties from the `info` column in the `system` table

Description of the need

Backdrop currently provides Views definitions to display module and theme information stored in the system database. Currently, it's possible to display theme/module filename, name, schema_version, status and type.

However, there is no way to display any of the information stored in the info column, which includes version, dependencies, backdrop version, tags, etc.

This is a request to add such a handler.

Proposed solution

Write a special field handler to display those values. Since the info column is a serialized array, there needs to be a special option definition and option form within the handler to select the specific setting to be displayed.

Alternatives that have been considered

None.

Draft of feature description for Press Release (1 paragraph at most)

Backdrop now includes a Views field handler to display setting information stored in the module and theme info files.