Implement paging and refactor stores to match new store interface with paging

storage/store/memory/util_bench_test.go

@@ -0,0 +1,20 @@
+package memory
+
+import (
+	"testing"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/storage/store/paging"
+)
+
+func BenchmarkShallowCopyServiceStatus(b *testing.B) {
+	service := &testService
+	serviceStatus := core.NewServiceStatus(service.Key(), service.Group, service.Name)
+	for i := 0; i < core.MaximumNumberOfResults; i++ {
+		AddResult(serviceStatus, &testSuccessfulResult)
+	}
+	for n := 0; n < b.N; n++ {
+		ShallowCopyServiceStatus(serviceStatus, paging.NewServiceStatusParams().WithResults(1, 20))
+	}
+	b.ReportAllocs()
+}