Cache

[WIP] some cache usable for large amount of storage of items

col, err := large.NewBuckettedSet[*test_util.TestItem](size*10, test_util.Hasher())
require.NoError(t, err)

items := test_util.Generate(int(size))
test_util.Shuffle(items)

for _, item := range items {
	v, ok := col.GetOrAdd(item)
	require.True(t, ok)
	require.Equal(t, v, item)
}