bloom cache: investigate lockless bloom filter

We have to use thread safe bloom filter, but locks are major overhead in there.
```
BenchmarkM_Add-12 500*2<<16 45.8 ns/op
BenchmarkM_Has-12 1000*2<<16 27.2 ns/op
BenchmarkM_AddTS-12 200*2<<16 132.4 ns/op
BenchmarkM_HasTS-12 200*2<<16 101.3 ns/op
```
It might be worth investigating how to make it works lockless with CompareAndSwapT function family.