feat: add a new base parser LazyLogFileOutput

- Doesn't like the LogFileOutput, the LazyLogFileOutput doesn't load the
  content during initialization, its content can only be loaded via calling
  the `do_scan` method explicitly.
- It's useful for the cases which need to load thousands of files belongs
  to one single Spec in one pass of running.
- For implementation's convenience, converted the "scanners" from `list`
  `dict` in which the `result_key` is key and `scanner` is value.  And
  removed the `scanner_keys`.
- Update the LsPci accordingly.
- see RHINENG-13810

Signed-off-by: Xiangce Liu <[email protected]>