We should add a new custom field type for numbers to increase the adoption of custom fields and empower users with more field types.
### DoD
- [ ] Users can configure a "Number" custom field type like the current custom fields. Only one number can be provided and it can be a decimal.
- [ ] The Kibana number formatting setting is taken into account.
- [ ] Users can specify if the field is required and provide a default value. Validation will apply to the default value to verify that the value is a valid number.
- [ ] Users can set the Number field type when creating a case. Validation will apply to verify that the value is a valid number.
- [ ] Users can edit the Number field type when viewing a case. Validation will apply to verify that the value is a valid number.
- [ ] Filtering by this field type is not needed
We should add a new custom field type for numbers to increase the adoption of custom fields and empower users with more field types.