MM-22785 audit server CLI (#14144)

Add auditing to server CLI.

Also:
- simplify auditing in API layer
- reduce number of AddMeta calls
- have models serialize themselves
- more consistent field naming

model/auditconv_test.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type Sample struct {
+	flag bool
+	name string
+}
+
+func TestAuditModelTypeConv(t *testing.T) {
+	sample := &Sample{flag: true, name: "sample"}
+	sample2 := &Sample{name: "sample2"}
+	sampleArr := []*Sample{sample, sample2}
+
+	user := &User{}
+
+	type args struct {
+		val interface{}
+	}
+	tests := []struct {
+		name          string
+		args          args
+		wantConverted bool
+		wantNewVal    interface{}
+	}{
+		{name: "nil value", args: args{val: nil}, wantConverted: false, wantNewVal: nil},
+		{name: "string value", args: args{val: "hello"}, wantConverted: false, wantNewVal: "hello"},
+		{name: "string array", args: args{val: []string{"hello", "there"}}, wantConverted: false, wantNewVal: []string{"hello", "there"}},
+		{name: "int value", args: args{val: 77}, wantConverted: false, wantNewVal: 77},
+		{name: "int array", args: args{val: []int{77, 68}}, wantConverted: false, wantNewVal: []int{77, 68}},
+		{name: "struct pointer value", args: args{val: sample}, wantConverted: false, wantNewVal: sample},
+		{name: "struct pointer array", args: args{val: sampleArr}, wantConverted: false, wantNewVal: sampleArr},
+		{name: "model user", args: args{val: user}, wantConverted: true, wantNewVal: "XXX"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotNewVal, gotConverted := AuditModelTypeConv(tt.args.val)
+			assert.Equal(t, tt.wantConverted, gotConverted)
+			if !tt.wantConverted {
+				assert.Equal(t, tt.wantNewVal, gotNewVal)
+			}
+		})
+	}
+}