feat: branded types for context, subcontext and features

[ivklgn]

now we can infer types from subcontext or features:

  const createErrorContext = createError([{ errorType: "ErrorType1" }, { errorType: "ErrorType2" }] as const);

  const errorContext1 = createErrorContext("Context1"); // infer: ErrorSubcontext<"Context1", "ErrorType1" | "ErrorType2">
  const errorContext2 = createErrorContext("Context2"); // infer: ErrorSubcontext<"Context2", "ErrorType1" | "ErrorType2">

  const featureError = errorContext.feature("Feature"); // infer: ErrorFeature<"Feature", "ErrorType1" | "ErrorType2">

as a result, we can more strictly specify the accepted contexts/features in our code

function foo(errorCtx: typeof errorContext1);