keep original data_deps while resolving graph

[changhai0109]

Target Issue #148

Summary

One of the future works on astrasim about memory requires getting the original data dependency from the workload. However, in the current implementation of ETFeeder the original data_deps will be mutated for recording dependency resolving. Here we introduce a duplication of data_deps called unresolved_data_deps which is specifically used for dependency resolving. This way we can keep original data_deps during resolving for purples of memory analysis.

Test Plan

Test it with AstraSIM run/example