fix: evaluate target lazily in Path

[unlsycn]

At the moment toTarget does not work properly with the D/I system, seeing that we cannot get the instanceName of a module when evaluating it, and even if we call toTarget in atModuleBodyEnd we will get the wrong circuit name since the definition of the module's parent is still in construction.

In order to construct Path properly, we need to defer the evaluation of target to the IR generation time in the isMember constructor, just as the other constructors already do.

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• Bugfix

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[jackkoenig]

Please add a test