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example: make goroutine trace example work (#95)

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src/31-goroutine/README.md
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# goroutine trace
TODO: make this work and implement the documentation
**UNFINISHED YET**: The offset of goid field is hardcoded. It was only tested on the bundled `go-server-http`. It MAY NOT WORK on other go programs.
The bundled fo program was compiled using go 1.17.0. The executable and source could be found at folder `go-server-http`.
This example traces the state switch of goroutines, and prints the corresponding state, goid, pid and tgid.
```console
root@mnfe-pve:~/bpf-developer-tutorial/src/31-goroutine# ecc goroutine.bpf.c goroutine.h
INFO [ecc_rs::bpf_compiler] Compiling bpf object...
INFO [ecc_rs::bpf_compiler] Generating export types...
INFO [ecc_rs::bpf_compiler] Generating package json..
INFO [ecc_rs::bpf_compiler] Packing ebpf object and config into package.json...
root@mnfe-pve:~/bpf-developer-tutorial/src/31-goroutine# ecli-rs run package.json
INFO [faerie::elf] strtab: 0x6fb symtab 0x738 relocs 0x780 sh_offset 0x780
INFO [bpf_loader_lib::skeleton::preload::section_loader] User didn't specify custom value for variable __eunomia_dummy_goroutine_execute_data_ptr, use the default one in ELF
TIME STATE GOID PID TGID
INFO [bpf_loader_lib::skeleton] Running ebpf program...
21:00:47 DEAD(6) 0 2542844 2542844
21:00:47 RUNNABLE(1) 0 2542844 2542844
21:00:47 DEAD(6) 0 2542844 2542844
21:00:47 RUNNING(2) 1 2542844 2542844
21:00:47 DEAD(6) 0 2542844 2542844
21:00:47 RUNNABLE(1) 0 2542844 2542844
21:00:47 RUNNABLE(1) 1 2542844 2542844
21:00:47 RUNNING(2) 2 2542847 2542844
21:00:47 WAITING(4) 2 2542847 2542844
....
```
Modify from https://github.com/deepflowio/deepflow
This example is provided as GPL license