"Selection list" should be removed from field types and given as an option for "number" and "plain text"

Problem/Motivation

"Selection list" should be removed from field types and given as an option for "number" and "plain text" to make it easier to understand as the selection list is just based on either string or number types.

Current hierarchy
Plain text, Number, Selection list

New hierarchy
Plain text -> normal field / Selection list
Number -> normal field / Selection list

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet