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[FabijanC]

Usage related changes

• Allow specifying maxFee and nonce.
• Introduce --account-contract flag for compiling account contracts.
  • Account contracts are currently those with a function called __execute__, hence the addition of such a test. Couldn't make it

Development related changes

• Enable wallet testing on devnet.
• Revert to es2016 in tsconfig.json (es2020 was never a part of an official plugin release, but happened in a commit between the latest release and this commit).
• Introduce copyWithBigint which basically takes an already existing functionality and wraps it into a function. The function is now used in one more place.
• Make Account methods protected.
• Unfortunately some hackiness is introduced in multiInteract in account.ts, if the reviewer should find a better way of dealing with it
• Refactor InteractChoice making it a class with methods and properties - pushes some logic directly into InteractChoice instead of having to write ifs and elses in various places.

Checklist:

• I have formatted the code
• I have performed a self-review of the code
• I have rebased to the base branch
• I have documented the changes
• I have updated the tests
• I have created a PR to the plugin branch of starknet-hardhat-example.