[tcgc] how can we rename an options bag's name?

[iscai-msft]

// By default, spread is spread: follow the TypeSpec blindly

// Make option bag generation the default for Java for the entire TypeSpec namespace.
// Use default strategy to pick up the name
@@optionBag(MyNamespace, "", "java")

// Use option bag for this operation, for rust. Generate name
@@optionBag(MyOperationn, "", "rust")

// Use option bag for this operation in Go, and name it explicitly
@@optionBag(MyOperation, "MyOperatitonOptions", "go")