feat: add a base parser LazyLogFileOutput (#4309)

- Doesn't like the LogFileOutput, this LazyLogFileOutput doesn't load the
 content during initialization.  Its content will be loaded later whenever
 the parser instance being used.
- It's useful for the cases where need to load thousands of files that
  belong 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`.
- Updated the LsPci accordingly.
- RHINENG-13810

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