Update examples CI (automatic test)

[Officeyutong]

This PR implements automatic testing of examples CI, using a python program.

Test process:

• Run server, monitoring the stdout until bpftime-syscall-server started appeared, with timeout of at most 15 seconds
• Wait for 10 seconds
• Run victim, monitoring stdout of server until the test-specified signal string appeared, with timeout of at most 15 seconds

Note:

• bashreadline is not supported now

[yunwei37]

You can open an issue to record the bashreadline state in test.

[Officeyutong]

You can open an issue to record the bashreadline state in test.

#79