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4337 Gas metering: Pimlico `VerifyingPaymaster` results, refactorings, groundwork for `ERC20Paymaster` (#401)

This PR updates the Pimlico benchmarking code to use the new v0.7
entrypoint and the new paymaster from Pimlico. Partially fixes
https://github.com/safe-global/safe-modules/issues/294 (Partially
because there are blockers related to the ERC20 Paymaster; I will
describe them below)

## Current Blockers For ERC20 Paymaster
- They use the official Circle's USDC deployments on testnets with no
liquidity, and the faucet drips 10 USDC daily. One user op costs around
7.
- There are some problems with gas pricing. Currently, it wants roughly
7 USDC for a user operation on Base Sepolia (approximately 2x higher
than the native token fee) and 537 USDC on Sepolia.

The Pimlico team have been informed regarding the same at the time of
writing this issue. Slack
[Link](https://5afe.slack.com/archives/C05JA2HFQ1J/p1716898930935779?thread_ts=1715862769.219249&cid=C05JA2HFQ1J).

## Changes completed/in-progress
- Using `base-sepolia` as well (`sepolia` sometimes has a high gas cost)
- Using new signing struct with the latest 4337 Safe Module
- Update of dependencies used in the Pimlico benchmark
- Code refactors and type improvements
- NPM scripts now explicitly contain the paymaster they should use
- Addition of `VERBOSE` environment variable that outputs handy logging
data to the console, which is very useful for debugging.
[Example](https://dashboard.tenderly.co/mikhail-gnosis/project/simulator/8f7d3c77-b98c-49fd-badf-b35e4f5310c5?trace=0.1.0.0.2.4.2.1.4.0.0.2.0)

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Co-authored-by: Mikhail <16622558+mmv08@users.noreply.github.com>

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