Add configuration for defaultColumns, createFields to Lists

At the moment, we’re showing all the fields as the default column set and in the create modal. It’s not particularly usable, and you can’t change it.

We’ve discussed a few different ideas here but for now I propose bringing forward two list options from Keystone 4: defaultColumns and createFields.

Both are space-separated lists of field paths, like this for your average User list config:

  fields: {
    name: { type: Text },
    email: { type: Text, isUnique: true },
    dob: {
      type: CalendarDay,
      format: 'Do MMMM YYYY',
      yearRangeFrom: 1901,
      yearRangeTo: getYear(new Date()),
    },
    password: { type: Password },
    isAdmin: { type: Checkbox },
    avatar: { type: File, adapter: avatarFileAdapter },
  },
  createFields: ['name', 'email', 'password', 'isAdmin'],
  defaultColumns: ['name', 'email', 'isAdmin'],
  labelResolver: item => `${item.name} <${item.email}>`,

Both could default to “all fields” as they currently do.

[jesstelford]

@dcousens #867 didn’t get merged. Gotta Cherry pick those changes out

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