Add sub-interface LogDescriptor.LogLine (and the extension to WebServerAccessLogLine)
Add sub-interface LogDescriptor.LogLine (and the extension to WebServerAccessLogLine), the first interface will simply provide one method that returns a line from the log.
LogDescriptor will need to be extended to provide all LogLines, which includes sub-interface specific parsing and retrieving the unrecognized lines up to a limit (100 for a start).
Sub-interface WebServerAccessLogLine, which extends LogLine, is more specific for access-logs and provides methods for all fields that contain useful data after the sanitation process, i.e., it doesn't provide all Apache log fields. (cf. discussion in #22983 (moved))