validation: remove dependency on `op-bindings`

[geoknee]

These have actually been removed from the monorepo, so depending on them blocks us from updating the validation->optimism dependency.

We can move bindings that we need into the validation package itself, or adopt a more lightweight "cast call" approach to scraping data from chain.

[geoknee]

Longer term we can

• strip down the bindings to only the necessary bits of code
• use a lighter-weight approach to scraping data from contracts:
  e.g. create some more helpers like this:

superchain-registry/validation/security-configs_test.go

Lines 106 to 107 in 4641467

	func getAddress(method string, contractAddress Address, client *ethclient.Client) (Address, error) {
	addr := (common.Address(contractAddress))