add eth_newPendingTransactionFilter to rpc method wrappers

[luu-alex]

eth_newPendingTransactionFilter exists in rpc methods, its just not being exposed by web3.eth. Double check and make sure other methods are implemented as well
#4483
https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_newpendingtransactionfilter

• List all RPC methods
• Move to library
• Doc Update

[mconnelly8]

9/3 Meeting - should have this to support execution level. Just need to expose it to the public in the lib.

[jdevcs]

following function are available in RPC Methods package but are not exported via Eth class:

Function Name	JSON RPC API	EL Specs
getCompilers	x	x
compileSolidity	x	x
compileLLL	x	x
compileSerpent	x	x
newFilter	✓	✓
newBlockFilter	✓	✓
uninstallFilter	✓	✓
getFilterChanges	✓	✓
getFilterLogs	✓	✓
submitHashrate	x	x
newPendingTransactionFilter	✓	✓