fix(levm): change gas consumption order and some logic

[JereSalo]

Motivation

• Gas consumption order is wrong, we are substracting balance from the user at the end of the transaction and that's not how it should be.
• There are some things to fix and organize related to gas usage so this PR can address that.

Description

• Contemplates gas refunds for coinbase fee
• Substracts up-front cost from user pre-execution and returns unused gas contemplating gas refunds post-execution.
• Changes behavior when reverting create post execution -> If revert reason is the RevertOpcode don't consume remaining gas.
• validate_transaction is now named prepare_execution because it both validates and makes pre-execution changes (that are very related with validations). Is has added functionalities like adding the value to the receiver's balance.
• It creates method post_execution_changes() for organizing transact() method

Tests Passing: 1734 total, with last main changes.

[ilitteri]

LGTM. Great work!

[maximopalopoli]

LGTM