UI: add call graph for each harness and related functions

[zjp-CN]

There have already been callees in the function info: e.g. https://github.com/os-checker/verify-rust-std_data/blob/a4ae14d87d38864433c7c6ada320e63d83c940ab/split/core/src/time.rs/103201209251474754949132317369828318810.json