feat(range): add label prop (#27408)

Issue number: N/A

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

Labels on `ion-range` can only be set via the `label` slot. When only
plain text is needed, this is cumbersome because you need to add an
entire new element to wrap the label.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

Label prop added. If both the prop and slot are used, the prop will take
priority.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

- Docs PR: https://github.com/ionic-team/ionic-docs/pull/2955
- Dev build: `7.0.6-dev.11683657201.139d03f4`

packages/vue/src/proxies.ts

@@ -606,6 +606,7 @@ export const IonRange = /*@__PURE__*/ defineContainer<JSX.IonRange, JSX.IonRange
   'color',
   'debounce',
   'name',
+  'label',
   'dualKnobs',
   'min',
   'max',