feat(entrykit): add custom paymaster client override

[dk1a]

Currently it's impossible to use entrykit with a custom paymaster client

This override is a simple solution, it may be better to move all the configuration there from Chain and making it just paymaster, rather than paymasterOverride. Related to the TODO for configuring createBundlerClient in general.

Since it's probably not relevant for quarry stuff, I ignore the override there

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[frolic]

can you share more about your use case? what do you need a custom client for that the chain config options doesn't help with?

[dk1a]

I just need a custom paymaster, the other aspects of the client are untouched.
More specifically I'm helping moving castles use base's paymaster, see https://docs.cdp.coinbase.com/paymaster/guides/quickstart for example, and passing the paymaster client to entrykit as an override

The chain config only allows a simple static contract address, not the full getPaymasterData or other details

This is relevant for other custom paymaster clients too, not just base

[dk1a]

The main reason I need to fork entrykit is that it does registerDelegation, which I also want to be aware of the custom paymaster, otherwise I could've probably just added it to the session client within the app itself