Refactor RJSF number handling

#### Description of the Tech Debt

We currently have both text and number handling in our custom TextWidget, which rjsf uses by default for anything with type "string" or "number." RJSF doesn't have a default NumberWidget we can override, so if we want to use a custom number widget, we'd have to go add that to uiSchema everywhere (this is what's done in CIF).

To-dos
- [ ] decide if we want to keep handling both string and number types in the TextWidget, or switch to a NumberWidget. Ideally, there's a way to make rjsf use this widget by default for anything with type: number. (NumberField is probably not the solution as we only care about rendering, not how the field actually works.)

#### Tech Debt Triage

The purpose of our technical debt triage process is to analyze technical debt to determine risk level of the technical debt and the value in tackling that technical debt.

#### Risk Value Scoring:

| Level | Value |
| ------ | --------------------- |
| High |

Start by reviewing the custom TextWidget and the uiSchema usage mentioned in the issue, then compare the proposed NumberWidget and NumberField approaches. Done means documenting and implementing a clear decision for how number types should be rendered by default.

Written by the indexing model from the issue text.