dev: query chain_id from Kakarot instead of computing it in the RPC to reduce probability of divergence

[Eikix]

Describe the enhancement request

in the RPC, we currently use the following formula to compute the kakarot chain id:

• get connected starknet chain's chain id
• do chain id modulo MAX_SAFE_CHAIN_ID
• store this value in the context of RPC

while this is currently valid, a new PR from kakarot sets the chain id of future kakarot deployments as <LEDGER_MAX_CHAIN_ID

Describe Preferred Solution

to limit chances of divergence between rpc code and kakarot code, RPC should query kakarot for its chain id with the eth_chain_id view entrypoint from kakarot at startup