Add Thai (`th-TH`) locale support

### Provide a general summary of the feature here

Add Thai (`th-TH`) locale support.

### 🤔 Expected Behavior?

The i18n provider should support the Thai language.

### 😯 Current Behavior

Thai is not supported

### 💁 Possible Solution

Based on [this discussion](https://github.com/adobe/react-spectrum/discussions/8158), locales are handled by Adobe's globalization team. From what I can tell, Adobe does support Thai for its products so I think this is a valid locale request for the globalization team. However, we would be happy to submit a PR with these translations if necessary.

### 🔦 Context

Our company supports `th-TH`. We would like react-aria to support `th-TH` directly so that we don't need inject a workaround.

### 💻 Examples

_No response_

### 🧢 Your Company/Team

_No response_

### 🕷 Tracking Issue

_No response_