Refactor 'TxValidator' further

[LukaszRozmej]

Goes deeper into #7386

Changes

• Adds syntactic sugar for validation
• Adds RegisterTxType as standard way of registering transactions
• Move TxValidator to array instead of dictionary
• Allow register TxValidator from plugins
• Remove tests that had 4844 but not 1559,
• Made 1559 enabled when 4844 is enabled.

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

[emlautarom1]

LGTM, only some small code style comments.