Friendly overload for `MsiGetSummaryInformation()` can't accept a null hDatabase value.

## Actual behavior

From the [docs](https://learn.microsoft.com/en-us/windows/win32/api/msiquery/nf-msiquery-msigetsummaryinformationw) as it's all I have to go on:

> If the database specified by the MsiGetSummaryInformation function is not open, you must specify 0 for hDatabase and specify the path to the database in szDatabasePath. If the database is open, you must set szDatabasePath to 0.

> If a value of uiUpdateCount greater than 0 is used to open an existing summary information stream, [MsiSummaryInfoPersist](https://learn.microsoft.com/en-us/windows/desktop/api/msiquery/nf-msiquery-msisummaryinfopersist) must be called before closing the phSummaryInfo handle. Failing to do this will lose the existing stream information.

## Expected behavior

That this SafeHandle parameter accepts null on the friendly overload and handles it interally like other SafeHandle types do.

## Repro steps

1. `NativeMethods.txt` content:
```
MsiGetSummaryInformation
```

2. `NativeMethods.json` content (if present): N/A

3. Any of your own code that should be shared? N/A

### Context

- CsWin32 version: 0.3.257
- Win32Metadata version (if explicitly set by project): N/A
- Target Framework: net472
- `LangVersion` (if explicitly set by project): N/A

Start by tracing generation for the MsiGetSummaryInformation entry point from the NativeMethods.txt repro and inspect how the friendly overload handles SafeHandle parameters. Done means the generated overload accepts a null hDatabase value and handles it consistently with other SafeHandle types; no specific test file is named, so add or run the relevant generator coverage.

Written by the indexing model from the issue text.