Have generated module interfaces inherit from IDisposable

[atifaziz]

The source generate implements the Dispose method for each generated module interface implementation:

CSnakes/src/CSnakes.SourceGeneration/PythonStaticGenerator.cs

Lines 110 to 115 in bdabf23

	public void Dispose()
	{
	logger.LogDebug("Disposing module {ModuleName}", "{{fileName}}");
	{{ string.Join(Environment.NewLine, functionNames.Select(f => $"this.{f.Field}.Dispose();")) }}
	module.Dispose();
	}

Since it doesn't advertise that, the implementation is publicly unreachable and therefore it's impossible to dispose a module and free its memory. This PR fixes that by having module interfaces inherit from IDisposable.