Fix plugin logging missing context fields

Fix an issue where context fields logged by server on behalf of plugins didn't contain correct name/value pairs:
- bump Logr version to add key/value methods to sugar logger
- expose factory args when configuring logging with custom target types (needed for FocalBoard to create log target adapter that converts typed fields into slices of interface{} as per plugin logging API)

app/server_test.go

@@ -536,7 +536,7 @@ func TestPanicLog(t *testing.T) {
 
 	cfg, err := config.MloggerConfigFromLoggerConfig(logSettings, nil, config.GetLogFileLocation)
 	require.NoError(t, err)
-	err = logger.ConfigureTargets(cfg)
+	err = logger.ConfigureTargets(cfg, nil)
 	require.NoError(t, err)
 	logger.LockConfiguration()