Update config, gas calculations, receipt fields according to OP's Fjord

[flcl42]

Resolves #7126

Changes

• Add Fjord fork to spec
• Consider Fjord rules in gas calculations
• Update receipt fields and remove L1GasUsed
• Requires not yet added EIP-7212

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

Documentation

Requires documentation update

• Yes
• No
• ?

Requires explanation in Release Notes

• Yes
• No