build+config: move maxlogfiles and maxfilesize to logger config

Add deprecation notices but continue to read both.

sample-lnd.conf

@@ -30,9 +30,12 @@
 ; Rotated logs are compressed in place.
 ; logdir=~/.lnd/logs
 
-; Number of logfiles that the log rotation should keep. Setting it to 0 disables deletion of old log files.
+; DEPRECATED: Use logging.file.max-files instead.
+; Number of logfiles that the log rotation should keep. Setting it to 0 disables
+; deletion of old log files.
 ; maxlogfiles=3
 ;
+; DEPRECATED: Use logging.file.max-file-size instead.
 ; Max log file size in MB before it is rotated.
 ; maxlogfilesize=10
 
@@ -985,6 +988,13 @@
 ; Disable logging to the standard LND log file.
 ; logging.file.disable=false
 
+; Number of log files that the log rotation should keep. Setting
+; it to 0 disables deletion of old log files.
+; logging.file.max-files=3
+
+; Max log file size in MB before it is rotated.
+; logging.file.max-file-size=10
+
 ; Compression algorithm to use when rotating logs.
 ; Default:
 ;   logging.file.compressor=gzip