* Lots of println to figure out what eth_getBlockByNumber does/should do
* Remove debugging
* Print warnings when fetching pending blocks
When calling `eth_getBlockByNumber` with `pending`, we now print a deprecation warning and:
* if a pending block is found, use it to respond
* if no pending block is found, respond as if if was a request for `Latest`
Addresses issue #8703 (not sure if it's enough to close it tbh)