Add MaxNoncurrentVersions to NoncurrentExpiration action (#13580)

This unit allows users to limit the maximum number of noncurrent 
versions of an object.

To enable this rule you need the following *ilm.json*
```
cat >> ilm.json <<EOF
{
    "Rules": [
        {
            "ID": "test-max-noncurrent",
            "Status": "Enabled",
            "Filter": {
                "Prefix": "user-uploads/"
            },
            "NoncurrentVersionExpiration": {
                "MaxNoncurrentVersions": 5
            }
        }
    ]
}
EOF
mc ilm import myminio/mybucket < ilm.json
```

internal/bucket/lifecycle/lifecycle_test.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -111,6 +112,12 @@ func TestParseAndValidateLifecycleConfig(t *testing.T) {
 			expectedParsingErr:    nil,
 			expectedValidationErr: nil,
 		},
+		// Lifecycle with max noncurrent versions
+		{
+			inputConfig:           `<LifecycleConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Rule><ID>rule</ID>><Status>Enabled</Status><Filter></Filter><NoncurrentVersionExpiration><MaxNoncurrentVersions>5</MaxNoncurrentVersions></NoncurrentVersionExpiration></Rule></LifecycleConfiguration>`,
+			expectedParsingErr:    nil,
+			expectedValidationErr: nil,
+		},
 	}
 
 	for i, tc := range testCases {
@@ -619,3 +626,24 @@ func TestTransitionTier(t *testing.T) {
 		t.Fatalf("Expected TIER-2 but got %s", got)
 	}
 }
+
+func TestNoncurrentVersionsLimit(t *testing.T) {
+	// test that the lowest max noncurrent versions limit is returned among
+	// matching rules
+	var rules []Rule
+	for i := 1; i <= 10; i++ {
+		rules = append(rules, Rule{
+			ID:     strconv.Itoa(i),
+			Status: "Enabled",
+			NoncurrentVersionExpiration: NoncurrentVersionExpiration{
+				MaxNoncurrentVersions: i,
+			},
+		})
+	}
+	lc := Lifecycle{
+		Rules: rules,
+	}
+	if lim := lc.NoncurrentVersionsExpirationLimit(ObjectOpts{Name: "obj"}); lim != 1 {
+		t.Fatalf("Expected max noncurrent versions limit to be 1 but got %d", lim)
+	}
+}