Action-testing: extend user actor with withdrawal txs

[protolambda]

Description

Withdrawals depend on the proposer working in action-testing. So this is now split from the main user-actor PR (#3628) to integrate with the proposer actor.

Update the withdrawals RPC client input to use minimal interfaces, and refactor to not tightly couple geth and eth client functionality. This enables the use of an instrumented client.RPC and mocks.

Depends on #3628

Depends on #3805

Tests

Test creates a withdrawal tx on L2, includes it, then makes proposal on L1 for the L2 blocks including the withdrawal, includes those on L1, checks the withdrawal period, and then completes the withdrawal.

Fix ENG-2763

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[mergify]

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[protolambda]

Will rebase this onto the proposer work so we can change it from draft to ready

[protolambda]

Rebased onto proposer-cleanup (#3805), we can now test withdrawals once the proposer actor makes its output root proposals.

[mergify]

Hey @protolambda! This PR has merge conflicts. Please fix them before continuing review.

[trianglesphere]

PR description still doesn't mention the refactoring in here.

[protolambda]

@trianglesphere updated, thanks

[mergify]

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