feat: Add isReadOnly render prop to ComboBox and NumberField

[devongovett]

Closes #6151

Adds isReadOnly render props and data-readonly attribute to ComboBox and NumberField for parity with other components.

[rspbot]

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[rspbot]

## API Changes

react-aria-components

/react-aria-components:ComboBoxRenderProps

 ComboBoxRenderProps {
   isDisabled: boolean
   isInvalid: boolean
   isOpen: boolean
+  isReadOnly: boolean
   isRequired: boolean
 }

/react-aria-components:NumberFieldRenderProps

 NumberFieldRenderProps {
   isDisabled: boolean
   isInvalid: boolean
+  isReadOnly: boolean
   isRequired: boolean
   state: NumberFieldState
 }

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