Change BlockNumber to BlockTags for existing APIs

[shemnon]

Some APIs specified in older JSON-RPC documentation
accepted a block number or a block tag. Some carried
that difference over, some didn't.

This delta adds tags as an option to

• eth_getBlockByNumber
• eth_getBlockTransactionCountByNumber
• eth_getUncleCountByBlockNumber
• eth_getTransactionByBlockNumberAndIndex

This brings those APIs in line with https://eth.wiki/json-rpc/API,
except for eth_getLogs and eth_newFilter which have only 50% support for block tags among clients

Signed-off-by: Danno Ferrin danno.ferrin@gmail.com

[lightclient]

Thanks @shemnon. It doesn't appear that fromBlock or toBlock accept block tags in geth. Do other clients support this? Since nil denotes it being the latest, I'm inclined to leave those two as-is and merge your other changes.

[shemnon]

Besu supports the block tag in filters. My querying of code indicates Nethermind does, and erigon does not.

All of the docs sites I can google indicate eth_getLogs and eth_newFilter should support tags. (mostly because they are cut and paste from the same original site).

However, I'm not aware of any tooling that expects it. I discovered HardHat will call eth_getBlockByNumber('latest') which is what prompted this audit.

Rolled back filter args because numbers are compatible with all 4 clients.