wslapi WslGetDistributionState proposal

Nobody has claimed this yet.

**Is your feature request related to a problem? Please describe.**
There seems to be no programmatic way to get the current state of a specific distro, currently there are no API functions that could get this information, nor it is stored/updated on the registry.

The only way I have found to actually know if a Distro is running or stopped is to get use wsl.exe --list --verbose or wsl.exe --list --running and parse the output.

**Describe the solution you'd like**
It would be nice if there is a function where you can pass the distro identifier and it returns its current state.
```
HRESULT WslGetDistributionState(
[in] PCWSTR distributionName,
[out] WSL_DISTRIBUTION_STATE wslDistributionState
);

typedef enum {
WSL_DISTRIBUTION_STATE_STOPPED = 0x0,
WSL_DISTRIBUTION_STATE_RUNNING = 0x1,
WSL_DISTRIBUTION_STATE_STARTING = 0x2,
WSL_DISTRIBUTION_STATE_STOPPING = 0x3,
} WSL_DISTRIBUTION_STATE;
```

**Describe alternatives you've considered**
n/a.

**Additional context**
I haven't found any other possible programmatic way to know what possible states there are or even any documentation on how the wsl.exe itself define a Distro state. As there is no 1:1 tie to any running processes or PID that could be binded to.

The issue names no implementation files or tests. Start by tracing how wsl.exe --list --verbose and --list --running determine a distribution's state, then review the existing WSL API patterns. Done means a supported API accepts a distribution identifier and reports its current state consistently.

Written by the indexing model from the issue text.