Update tutorials to Arbitrum SDK v4 and Solidity 0.8

[TucksonDev]

ATTENTION: DO NOT MERGE THIS PR UNTIL ALL TUTORIALS HAVE BEEN UPDATED

This PR will be the root of further PRs that update tutorials in chunks. All those PRs will be merged here, and this one will be merged once all tutorials are up to date. This prevents having outdated and updated tutorials at the same time in the repository.

Description:

This PR updates all tutorials to use the Arbitrum SDK v4 and Solidity 0.8. It includes the following changes:

• Update ArbitrumSDK to 4.0
• Update Solidity code to ^0.8.0
• Changed the format of the environment variables to include Orbit chains: It's now CHAIN_RPC and PARENT_CHAIN_RPC
• Changed all L1-L2 nomenclature to ParentChain-ChildChain (following the ArbSDK nomenclature)
• Moved hardhat, eslint and prettier dependencies to the root of the project. The arbitrum-sdk dependency is left in each package so if in the future we need to do these partial updates, it's easier to manage

PRs with changes:

• Base changes, and tutorials address-table and contract-deposit : Update tutorials to ArbSDK v4 (1) #125
• custom-gateway-bridging and custom-token-bridging: Update tutorials to ArbSDK v4 (2) #126
• delayedInbox-l2msg, eth-deposit, eth-deposit-to-different-address, eth-withdraw: Update tutorials to ArbSDK v4 (3) #127
• gas-estimation, greeter, l1-confirmation-checker: Update tutorials to ArbSDK v4 (4) #128
• l1-l3-teleport, l2-block-verification-in-assertion, outbox-execute: Update tutorials to ArbSDK v4 (5) #129
• redeem-failed-retryable, token-deposit, token-withdraw: Update tutorials to ArbSDK v4 (6) #130