fixes is_cpu_op conversion in constructor

[AlexandruAntonescuKeysight]

Summary

This PR fixes the is_cpu_op() method which was always returning false, due to a wrong conversion in the constructor.

• the is_cpu_op() method is returning bool, but variable is_cpu_op_ was of type uint32_t --> changed it to bool
• the conversion in the constructor of ETFeederNode was being done in uint32_t instead of bool --> changed it to bool
• in trace, the value for is_cpu_op attribute is a bool

Test Plan

I've tested using 2 different traces, converted them to json using chakra_jsonizer and checked if the value returned by is_cpu_op() method for a specific node is the same with the one from the json.

[github-actions]

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[srinivas212]

@AlexandruAntonescuKeysight merging this PR. We should discuss adding unit tests for C++ code.