[FEATURE] Add uprobe example to trace bash commands

[yunwei37]

Is your feature request related to a problem? Please describe.

No uprobe example available now, so we need to add one.

Describe the solution you'd like

Add a uprobe example for wasm-bpf. A possible example can be https://github.com/iovisor/bcc/blob/master/libbpf-tools/bashreadline.c

[yunwei37]

close as complete.