[wip] L0 LRU experiment

[AskAlexSharov]

32-items cache. Only L0:

eth-mainnet:
a=accounts hit=13700 miss=9803 ratio=0.58
a=storage hit=12500 miss=22865 ratio=0.35
a=code hit=17500 miss=12962 ratio=0.57

bor-mainnet
a=code hit=420500 miss=96412 ratio=0.81
a=storage hit=26000 miss=103800 ratio=0.20
a=accounts hit=10100 miss=9450 ratio=0.52

---

128 items cache. all levels:

bor-mainnet
a=accounts hit=1606275 total=2000000 ratio=0.80
a=code hit=5201420 total=7000000 ratio=0.74
a=storage hit=1793932 total=5000000 ratio=0.36

[awskii]

I was also thinking to use a little cash but inside of btree index instead of Domain