perf: state root cache test

[rodrigo-o]

Description

This is just a test PR, to validate that moving the cache of the state root to the current block enhance block procesing by nearly 3s in mainnet. This is not intended to be merged, just used as reference on other tests

[rodrigo-o]

This generates a couple of issues related to block signature that we need to check, it was just a POC of moving around the cache and make sure how much it enhance the block processing

[rodrigo-o]

The block processing has reduced its time by ~3/4 seconds

Before

INFO 19:30:26.903 [Fork choice] Adding new block slot=10997406 root=0x172..b1a8
INFO 19:30:42.722 [Fork choice] Block processed. Recomputing head. 
INFO 19:30:43.274 [Fork choice] Added new block slot=10997406 root=0x172..b1a8
INFO 19:30:43.274 [Fork choice] Recomputed head slot=10997406 root=0x172..b1a8
INFO 19:30:43.274 [Fork choice] Block processing time: 15.819s | Recompute head time: 0.176s 

INFO 19:30:43.276 [Fork choice] Adding new block slot=10997407 root=0xe95..672d
INFO 19:30:59.552 [Fork choice] Block processed. Recomputing head. 
INFO 19:31:00.352 [Fork choice] Added new block slot=10997407 root=0xe95..672d
INFO 19:31:00.353 [Fork choice] Recomputed head slot=10997407 root=0xe95..672d
INFO 19:31:00.353 [Fork choice] Block processing time: 16.276s | Recompute head time: 0.288s

After

INFO 18:22:35.125 [Fork choice] Adding new block slot=11011512 root=0x0b8..3c58
INFO 18:22:47.930 [Fork choice] Block processed. Recomputing head. 
INFO 18:22:48.380 [Fork choice] Added new block slot=11011512 root=0x0b8..3c58
INFO 18:22:48.380 [Fork choice] Recomputed head slot=11011512 root=0x0b8..3c58
INFO 18:22:48.380 [Fork choice] Block processing time: 12.805 s | Head recompute time: 0.451 s 

INFO 18:22:48.382 [Fork choice] Adding new block slot=11011513 root=0xfed..6abf
INFO 18:22:59.945 [Fork choice] Block processed. Recomputing head. 
INFO 18:23:00.447 [Fork choice] Added new block slot=11011513 root=0xfed..6abf
INFO 18:23:00.447 [Fork choice] Recomputed head slot=11011513 root=0xfed..6abf
INFO 18:23:00.447 [Fork choice] Block processing time: 11.563 s | Head recompute time: 0.502 s 

[ElFantasma]

Added telemetry instrumentation for process_slot function to improve Grafana precision in fork choice handler times chart:
Now we can measure this PR impact on charts:
Before:

After: