HeaderedContentControl missing Padding passthru

### Describe the bug

Setting `Padding` on HeaderedContentControl does nothing.

I think this is passed through for HIC, but maybe not for HTV as well?

We should ensure template bound common properties are setup.

Not sure if it should apply just to content and/or header. Whichever one it doesn't control should probably have a resource key.

### Steps to reproduce

```text
Add HCC to project
set padding
```

### Expected behavior

padding changes

### Screenshots

_No response_

### Code Platform

- [x] UWP
- [x] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 10 21H2 (Build 19044)
- [ ] Windows 10 22H2 (Build 19045)
- [ ] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Windows 10, version 2104 (Build 20348)
- [ ] Windows 11, version 22H2 (Build 22000)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

_No response_

### Help us help you

Yes, but only if others can assist.

Start at the HeaderedContentControl implementation and its control templates, then reproduce the issue by setting Padding on an HCC in a UWP or WinUI 3 project. Check how template-bound common properties are handled for related controls such as HIC and HTV. Done means Padding visibly changes and the intended content/header behavior, including any resource key, is defined.

Scritto dal modello di indicizzazione a partire dal testo della issue.