Flag Enum Warning Enum.HasFlag(Enum) for Zero

**Brief description:**

There are scenarios where it makes no sense to check Enum.HasFlag against zero, because it is always true.
Like here:

```csharp
[Flags]
public enum Permissions
{
None = 0,
Read = 1,
Write = 2,
Delete = 4
}
```

Permission is not None when the enum is higher than zero.
In this scenario, it is for zero only useful to check `== Permissions.None`

I would like to have an Attribute that throw an Compiler Warning when `.HasFlag(Permission.None)` or `.HasFlag(0)` is used.
If the value cannot be determined at compile time, it should be ignored. This Issue is for compile-time constants to improve code clarity.

My Idea is Like:
```csharp
[Flags]
public enum Permissions
{
[NotFlagable]
None = 0,
Read = 1,
Write = 2,
Delete = 4
}
```

Or an alternative:
```csharp
[Flags]
[ZeroIsNotFlagable]
public enum Permissions
{
None = 0,
Read = 1,
Write = 2,
Delete = 4
}
```

**Languages applicable:**

C# and VB

**Code example that the analyzer should report:**

```csharp
[Flags]
public enum Permissions
{
[NotFlagable]
None = 0,
Read = 1,
Write = 2,
Delete = 4
}

public class Example
{
public void Check(Permissions permission)
{
if (permission.HasFlag(Permissions.None)) // should be reported
{
}

if (permission.HasFlag(0)) // should also be reported
{
}

if (permission.HasFlag(Permissions.Read)) // should not be reported
{
}
}
}

```

**Documentation requirements:**

When this analyzer is implemented, it must be documented by following the steps at [Documentation for IDE CodeStyle analyzers](https://github.com/dotnet/roslyn/blob/main/docs/contributing/Documentation%20for%20IDE%20CodeStyle%20analyzers.md).

The issue names no implementation files or tests. Start with the linked guidelines for new rules and the documentation for IDE CodeStyle analyzers, then identify the existing C# and VB analyzer entry points for Enum.HasFlag. Done means a documented warning for compile-time zero arguments, while unknown values and nonzero flags remain unreported.

Written by the indexing model from the issue text.