Configuration enhancement (search, value sort fields, allow raw data storage)

[mfendeksilverstripe]

Description

• add the ability to specify search, value and sort fields which were previously hard coded
• add the ability to store raw data to cover the cases where data serialisation is done on the model level as opposed to the controller level (form), this allows more flexibility when using various combinations for DB and form fields

Additional context or points of discussion

No response

Validations

• You intend to implement the feature yourself
• You have read the contributing guide
• You strongly believe this feature should be in core, rather than being its own community module
• You have checked for existing issues or pull requests related to this feature (and didn't find any)

PRs

• #274

[mfendeksilverstripe]

Implemented in #274