* feat: support for txpool API
* feat: add a geth spawner test helper
* fix(txpool): use TxRequest instead of new data struct
The `raw` field is no longer present in latest geth's response.
* fix(txpool): use proper api response format
ref: https://github.com/ethereum/go-ethereum/pull/21720
Also add a Geth test
* ci: install geth 1.9.23
Co-authored-by: Rohit Narurkar <rohit.narurkar@protonmail.com>