[TVMScript] TracedObject class that simplifies tracing ObjectPaths #12299
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Motivation: when printing a piece of TIR, we need to track an ObjectPath from the root TIR object to the currently printed object. This means that we need a convenient way to maintain an ObjectPath whenever we access a sub-object, e.g. via an attribute.
Tracking issue: #11912
cc @yelite @junrushao1994