Add options specifying behavior when filter is missing.

[Eskibear]

Just want to call out here, In .NET, we have an option to decide the behavior when filter can not be found:
https://github.com/microsoft/FeatureManagement-Dotnet/blob/main/src/Microsoft.FeatureManagement/FeatureManagementOptions.cs
The default behavior is throwing exception instead of slient error.

And there was a discussion about this design: microsoft/FeatureManagement-Dotnet#248

But it's not necessary to make JS FM lib completely same as .NET FM lib. Just put it here, for your reference.

Originally posted by @zhiyuanliang-ms in #1 (comment)

[zhiyuanliang-ms]

requirement_type=All should not allow missing filter