Fully apply EIP-1898 in specs

[fjl]

EIP-1898 is in Final status. It adds the option to use a block hash in several state access methods, where previously a block number was the only option.

The spec mostly has this covered with the BlockNumberOrTagOrHash type:

execution-apis/src/schemas/block.yaml

Line 130 in 3547418

BlockNumberOrTagOrHash:

However, the spec is missing the case where the input is a JSON object like {"blockHash": "0x...", "requireCanonical": true} is given. We need to add this to the spec and also create tests that verify this with all the methods which are affected.

Unfortunately, we do not have any sidechains in the test chain, i.e. we can't query for non-canonical blocks. Either this part will have to be left untested or we need to updated the test methodology to import a sidechain before importing the canonical one.

[MysticRyuujin]

Sounds like the 1st step is to write a test to see if the clients accept a JSON Object in place of the string