feat(providers): Perform Endpoint Validation

[refcell]

Description

Note

Background context: #37 (comment)

There's no way of currently knowing if providers using external RPCs support the various rpc methods.
Since some nodes gate certain methods to control traffic, it would be useful to validate external rpc urls to ensure those methods are available.

One way to perform this validation is by defining a Validator trait that external providers need to implement - and can be implemented locally through a wrapper type.

Current Kona Methods

L1 Provider

• eth_chainId: used by ChainProvider::chain_id
• debug_getRawHeader: used by ChainProvider::header_by_hash
• debug_getRawReceipts: used by ChainProvider::receipts_by_hash
• debug_getRawBlock: used by ChainProvider::block_info_and_transactions_by_hash

L2 Provider

• eth_chainId: used by L2ChainProvider::chain_id
• eth_blockNumber: used by L2ChainProvider::latest_block_number
• debug_getRawBlock: used by L2ChainProvider::payload_by_number

Validation

• debug_getRawTransaction

[merklefruit]

blocked by #35, this sounds like it would work as a part of the RPC crate