add minimum check in check_gas_limit with unit test

[tcoratger]

Description

This pull request introduces a minimum gas limit check within the check_gas_limit function, accompanied by a corresponding unit test.

Changes Made

• Added a check to ensure that the child gas limit does not fall below the minimum allowed limit (MINIMUM_GAS_LIMIT) in the check_gas_limit function.
• Included a unit test (test_gas_limit_below_limit) to verify that the minimum gas limit check is functioning correctly.

Motivation

Ensuring that the child gas limit does not go below a specified minimum is crucial for maintaining network integrity. This addition helps prevent gas limit values that could potentially cause issues within the Ethereum consensus.

[mattsse]

lgtm!

pending @Rjected

[Rjected]

LGTM, thanks!

[tcoratger]

@mattsse Small question here: as the validate_header_regarding_parent function is made to validate a header in relation to its sealed parent, why not implement this method directly on the Header structure rather than here? Because of the consensus errors that emerge?

[mattsse]

good point, technically this doesn't require the parent block and could/should be performed when we validate the header standalone

I also see that we have a few functions that we don't use like full_validation which we could remove.

and honestly, I'm not super happy with the function name inconsistencies like

reth/crates/consensus/common/src/validation.rs

Line 425 in b713408

pub fn validate_4844_header_with_parent(

reth/crates/consensus/common/src/validation.rs

Line 296 in b713408

pub fn validate_header_regarding_parent(