refactor: replace deprecated @eth-op/sdk with viem
#763
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This change updates the gasPriceOracle to leverage viem's gas pricing strategies. This is beneficial because viem has an active community that are actively adding support for new chains and improving support for existing chains. An example of this is Linea, where linea_estimateGas is supported out of the box after a recent update. In order to maintain some degree of compatibility with existing users of the gasPriceOracle, the external interface still accepts an ethers Provider instance. It then internally instantiates a viem PublicClient instance and uses that instead. There is still a residual issue of how to resolve the relevant provider URLs, since it's not necessarily reliable to pull from the provider due to the uncertain type (i.e. StaticJsonRpcProvider or one of the extended variants that wraps multiple providers).
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Closes ACX-3036
Leaving as a draft until #745 is merged and tested.