Bounce back invalid transactions

[FabijanC]

Usage related changes

• Properly bounce-back invalid transactions (according to the first four steps here)

Development related changes

• Fix nonce specification in invoke testing utility
• Refactor mapping of gateway to RPC errors
• Support some errors from RPC specification 0.4.0 for proper mapping
• Move internal tx creation into TransactionHandler
• Some tests required max_fee to be reduced because, although sufficient, it was exceeding the available balance (mostly replaced 1e18 with 1e15)
  • test_fork.py::test_forking_testnet_from_too_early_block was failing, but due to an unexpected cause (insufficient balance), it should be failing due to contract not being deployed yet (now it does after a fix)
• Some error expectations had to be changed: instead of checking the reason of being reverted in get_tx response (no longer available for validation failures), we now expect an immediate error (manifested in interaction with Starknet CLI - relying on ErrorExpector for this)

Checklist:

• Applied formatting - ./scripts/format.sh
• No linter errors - ./scripts/lint.sh
• Performed code self-review
• Rebased to the last commit of the target branch (or merged it into my branch)
• Documented the changes
• Linked the issues which this PR resolves
• Updated the tests
• All tests are passing - ./scripts/test.sh

[mikiw]

looks legit to me