`react-aria-components/Tooltip`: `state.placement` should receive full `Placement` instead of `PlacementAxis`

### Provide a general summary of the feature here

Currently the `state.placement` in `className` or `style` callback is a `PlacementAxis`, which only contains `top` | `bottom` | `left` | `right`.

When the position of the tooltip needs to adjust, it may also need to flip.

e.g. a button at the top-left corner with a tooltip `placement='top end'` should flip on both axis to `bottom start`.

Currently we only get `bottom` which does not provide enough information to adjust the css accordingly.


### 🤔 Expected Behavior?

`state.placement` contain full `Placement` information.

### 😯 Current Behavior

`state.placement` only contains `PlacementAxis` values.

By the way, do you know in what case `state.placement` will contain the value `center`?

### 💁 Possible Solution

_No response_

### 🔦 Context

The solution is not complete.

### 💻 Examples

_No response_

### 🧢 Your Company/Team

Palo Alto Networks

### 🕷 Tracking Issue

_No response_