Add Arbitrum

This MR will target the EVM factorization + adds the corresponding logic for Arbitrum chain.

Implementation of thorchain/thornode!2859 (merged) and thorchain/thornode!2607 (merged)

Merge commit is 0d8b7084

Closes #4 (closed)

requested review from @ahdzib and @chacMaya

assigned to @Bitol

Need to check some gas specs and docker for this pr

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• 4a9e5dc7 - Fix build and most of unit tests

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• b7aa437b - Fix spaces + default-leveldb definition

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• c04da223 - Implement THORChains MR 2607

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• f1ca7c5b - Fix lint

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changed the description

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• d7654f74 - Add missing ETH files

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• 611e62ee - Add 0x9702230A8Ea53601f5cD2dc00fDBc13d4dF4A8c7 to mocknet

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• 1d6b2559 - Add missing HOST definitions

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• 1289edd2 - Fix avax contract deployment

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• 345fe263 - Add tools to gitignore

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• da0d369a - Fix ethereum.py + Chnage token to 0x52C84043CD9c865236f11d9Fc9F56aa003c1f922

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• 8124803a - Fix geth command

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• a16b2480 - Add new tokens to ETH mocknet + new version

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• a16b2480...ba38e4e9 - 8 commits from branch develop
• da7d7e24 - Merge branch 'develop' into 'add-arb'

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• a813e2cb - WIP: Add ARB to v109 chains
• 9c1ea29d - WIP: Change eth service

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• 48db0ba8 - wip add arb to mocknet

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• a8e24211 - WIP: Deploy ARB contract in ETH
• 3a01de84 - WIP: Modify arb files

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