Changelog:
=========
-Update documentation to include blob transaction signing example.
-Import cytoolz methods via eth_utils instead of cytoolz directly
-Add encode_typed_data to list of functions that return a SignableMessage
-Add support for type 3, BlobTransaction, introduced by the Cancun network upgrade.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
