Node generation

[maypok86]

Clarification and motivation

Now otter static configuration of nodes, because of that in most cases, so it is worth trying with codegeneration to reduce memory consumption, and also it will allow using queue for expiration policy with constant ttl (queue) and timing wheel.

Acceptance criteria

1. Node generation added
2. Added expiration policies for constant ttl and variable ttl
3. The implementation is covered by tests