Router Refactor: Conditional Route Logic

[larsmaxwell]

1. Conditional Path logic
   RouterContext uses conditional path property (ln 33)

const conditionalPath =
        ((current?.element as ReactElement)?.props as { type: string })
          ?.type === 'conditional';

instead of just checking for the existence of a conditional property:

      const condition = (
        (current?.element as ReactElement)?.props as { condition: string }
      )?.condition;

2. RouterContext.tsx currently uses useField when you could probably hook into the Formik context to get the field value. Determine which method is least expensive, and change it if necessary:
   const field = condition ? useField(condition) : null;