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/helper_test.go

@@ -82,7 +82,7 @@ func setupTestHelper(dbStore store.Store, enterprise bool, includeCacheLayer boo
 
 	testLogger, _ := mlog.NewLogger()
 	logCfg, _ := config.MloggerConfigFromLoggerConfig(&memoryConfig.LogSettings, nil, config.GetLogFileLocation)
-	if errCfg := testLogger.ConfigureTargets(logCfg); errCfg != nil {
+	if errCfg := testLogger.ConfigureTargets(logCfg, nil); errCfg != nil {
 		panic("failed to configure test logger: " + errCfg.Error())
 	}
 	if errW := mlog.AddWriterTarget(testLogger, buffer, true, mlog.StdAll...); errW != nil {