add $label parameters to error, warn, info, log methods. issue #6370
add $label parameters to error, warn, info, log methods. issue #6370
Update FirePhpBridge.php
#6374 #6370 - reverting BC break in interface signature, since PHP allows additional optional parameters to be defined in implementing classes
#6374 #6370 - using nullable `$label` in the `FirePhpBridge` to avoid BC breaks
Merge branch 'feature/#6374-#6370-pass-label-to-firephp-bridge-log-writer' into develop

Close #6374
Close #6370