Discuss the role of field storage definitions for computed fields.

Problem/Motivation

Follow-up discussion from #2935932: Add a BundleFieldDefinition class for defining bundle fields in code..

Currently an associated field storage definition is a requirement of all field definitions, including computed ones.

• Should that be the case?
• Can we improve the DX for storage definitions for computed fields?

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes