Support generic parameters

[aradalvand]

Describe the feature

I wanted to do this:

/// <summary>
/// Represents a single-iteration BLAKE2d hash.
/// </summary>
/// <typeparam name="TUnderlyingType">
/// The point is to associate the hash with a specific underlying type (normally a domain-specific value object), for documentation purposes, and also to prevent comparing hashes of different underlying types.
/// </typeparam>
[ValueObject<string>]
public readonly partial struct Hash<TUnderlyingType>
{
    /// <summary>
    /// Hashes the provided string with BLAKE2d and returns a <see cref="Hash"/> instance that represents it.
    /// </summary>
    public static Hash<TUnderlyingType> Of(TUnderlyingType input)
    {
        byte[] inputBytes = Encoding.UTF8.GetBytes(input);
        var hash = new byte[64];
        BLAKE2b.ComputeHash(hash, inputBytes);
        return From(Convert.ToBase64String(hash));
    }
}

And realized that Vogen fails to generate code for this declaration. I see no reason why it shouldn't be able to.
The point of the generic argument, in this particular case, is to associate the hash with a specific underlying type (normally a domain-specific value object), for documentation purposes, and also to prevent comparing hashes of different underlying types.

What I want to be able to do is something like this:

[ValueObject<string>]
public readonly partial struct SessionKey; // This being a Vogen type is irrelevant here

// Usage:
Hash<SessionKey> sessionKeyHash = ...;

Please make it so that the source generator just does its thing regardless of whether or not the type has generic parameters. It would enable patterns like this one. I'd appreciate it.