Fix EIP-7623 gas calculation and tests

[2dvorak]

Proposed changes

This PR fixes gas calculation logic for EIP-7623 changes introduced in #200
Also, this PR fixes gas calculation tests accordingly.
Added state transition test for EIP-7623.

Kaia-specific gas calculation logic

EIP-7623 states that the new formula for gas calculation as follows:

tx.gasUsed = (
    21000
    +
    max(
        STANDARD_TOKEN_COST * tokens_in_calldata
        + execution_gas_used
        + isContractCreation * (32000 + INITCODE_WORD_COST * words(calldata)),
        TOTAL_COST_FLOOR_PER_TOKEN * tokens_in_calldata
    )
)

Geth's implementation for above formula is:

max(total_gas_used, 21000 + floor_gas)

However Kaia has different TxGas for different tx types, for example fee delegated tx has 21000 + 10000.
That would make our implementation:

max(total_gas_used, tx_gas_per_tx_type + floor_gas)

Furthermore, we have additional gas for signature validation for fee delegated tx.
That would further complicate our implementation to:

max(total_gas_used, tx_gas_per_tx_type + sig_validation_gas + floor_gas)

Impact on our code

As a result, our code for intrinsic gas changed from:

func ValidatedGas() uint64 {
	return intrinsicGas + senderValidateGas + feePayerValidateGas
}

to:

type ValidatedGas struct {
	IntrinsicGas   uint64
	SigValidateGas uint64
}

func ValidatedGas() *ValidatedGas {
	return &ValidatedGas{
		IntrinsicGas: intrinsicGas,
		SigValidateGas: senderValidateGas + feePayerValidateGas
	}

because we need SigValidateGas for gas comparison max(total_gas_used, tx_gas_per_tx_type + sig_validation_gas + floor_gas)

Note that unrelated fields or variables are omitted for brevity.

Types of changes

Please put an x in the boxes related to your change.

• Bugfix
• New feature or enhancement
• Others

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• I have read the CLA and signed by comment I have read the CLA Document and I hereby sign the CLA in first time contribute
• Lint and unit tests pass locally with my changes ($ make test)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

#200

[hyeonLewis]

Is WIP: Add EIP-7623 tests done with current testings?

[2dvorak]

@hyeonLewis Yes, I've updated the description. Thank you!