create regex-matcher for multi-line support

[kortemik]

see cfe-01 with the start-regex matching feature. allow timeout for new lines so messages terminate even if no new ones are coming up, like on cfe-01.

#16 related

[StrongestNumber9]

Just as a reference:

Logging:

"command": [
    "/usr/bin/bash"
],
"args": [
    "-c",
    "echo 'I am first pod'; echo -e 'This is an example\nmultiline\nlog message'; sleep inf;"
]

Output:

# cat /var/log/pods/default_first-pod_fa1cff2a-0ad8-4039-8d98-8af16a6016ab/first-pod/0.log
{"log":"I am first pod\n","stream":"stdout","time":"2023-05-22T15:18:45.081887403Z"}
{"log":"This is an example\n","stream":"stdout","time":"2023-05-22T15:18:45.08192463Z"}
{"log":"multiline\n","stream":"stdout","time":"2023-05-22T15:18:45.081934895Z"}
{"log":"log message\n","stream":"stdout","time":"2023-05-22T15:18:45.081941044Z"}