[EIP-7706] State transition gas handling

[mralj]

This is the first PR tackling #12 (EIP-7706)

New transaction type

As per EIP-7706, this PR adds a new transaction type, called tx_vector_fee, named that way to immediately suggest that our fees are now multi-dimensional.
Furthermore, I've updated the core transaction type as well as the "old" transaction types (i.e., tx_dyamic_fee, tx_legacy, etc.) to align them with this EIP.

State transition gas changes

The focus of the PR is "gas handling" changes per EIP-7706 during state transition.
By "gas handling" I mean:

1. Executing necessary gas validations (e.g., does the address have enough balance to cover gas + value costs)
2. Purchasing gas
3. Paying priority fees
4. Refunding "over-purchased" gas back to address

Changes to state_transition follow this "template," exemplified on the preCheckGas

// ... 
// [rollup-geth]
if preCheckGasErr := st.preCheckGas(); preCheckGasErr != nil {
    return preCheckGasErr
}
// ...

This is to say, when, e.g., doing "gas pre-checks," I have:

1. Extracted this code to separate function preCheckGas
2. This function checks if the new EIP-7706 is enabled and, based on this, calls either
3. "new EIP-7706" (preCheckGasEIP7706) or the "old code," now moved to the function preCheckGasEip4484

As mentioned above, other changes like buying gas or refunding gas follow the same pattern.
Code in the *EIP4484 functions is unchanged from the upstream

What's missing

Well everything not mentioned above 😅
But most importantly, block changes required by EIP-7706 are not in this PR, but they are planned for the next one :)