Gas validation: Add an exception for Base

[vdamle]

As noted in issue#800, we are adding an exception for the gas validation check for Base with an explicit directive for it to be removed when Base adheres to the standard charter.

Adding a New Chain

N/A

Checklist

• I have declared the chain at the appropriate Superchain Level.
• I have run just validate <chain-id> locally to ensure all local validation checks pass.
• I have run just codegen to ensure that the chainlist and other generated files are up-to-date and include my chain.

Ref: #800

[bitwiseguy]

Could we move the exception here instead? Its nice to have a central place for all exceptions/exclusions

[vdamle]

Could we move the exception here instead? Its nice to have a central place for all exceptions/exclusions

Thanks @bitwiseguy . Updated now