BEEFY light client and fee market gas opt

[hujw77]

BEEFY light client

• remove mmr in storage
• change max authority set len from 1000000 to 256 (decrease 4.2w gas)
• compact storage slot
• compact validationData
• unify sparse tree verify
• opcode opts
• support eip-2098 Compact Signature Representation
• convert solc from 0.8.11 to 0.7.6, remove Checked Arithmetic

Before

1. https://dashboard.tenderly.co/tx/bsc-testnet/0x4ccac6351eccb0af91488d48ff6ba3a01d46d8ee20f960054cbdb1dc557322bc/gas-usage Gas Used: 174,298
2. https://dashboard.tenderly.co/tx/bsc-testnet/0x4c0ad9109fa2d53008f56c71f394142d81c3a569896d3f25f7622b78a58ed061/gas-usage Gas Used: 435,729 Total: 610027

After

1. https://testnet.bscscan.com/tx/0x0526129878a7ca4ef5163ce879eb1c2dd607445875ae668dfe6f68b2486deaee Gas Used: 106,333
2. https://testnet.bscscan.com/tx/0x130a39500642f67c7b77b70206c066366cfef402876abac38da0cd6d02376531 Gas Used: 278,450 Total: 384,783

Diff

Gas: -225244 ~37%

Simple Fee Market

• decrease assignedRelayersNumber from N to 1.
• remove VAULT for receiving surplus, because of message fee equal to base fee.
• combine Order and OrderExt to Order.

Message layer

• only store message hash in storage
• rm white list in out lane

Issues

Fix #133 Fix #144 Related #147

[hujw77]

@HackFisher @xiaoch05 Any more suggestions for gas saving ?

[hujw77]

Set threhold to 22, and MIN_SUPPORT to 28 ether (120000000/2**22 = 28.6)

1. https://dashboard.tenderly.co/tx/bsc-testnet/0x2cbeb1ca819bc3dbb80bb318bed1f74b91d94b604f625163916c602bdef78aec/gas-usage

2. https://dashboard.tenderly.co/tx/bsc-testnet/0xc1e2858eb79929b1806987e0cb6c068e335e58533f16340d7c98d8ed54a3aa68/gas-usage

Diff

Gas Used: -122058 ~20%