Implement Support for ERC-4337 EntryPoint v0.7

[mmv08]

This PR:

• Addresses the M-01 from the audit by updating the ERC-4337 contracts to the latest ones from the development branch (presumably, they will be released as version 0.7.0). The most notable change is the new PackedUserOperation struct with the new packed gas limit field accountGasLimits that consists of two uint128 packed values (validationGasLimit, callGasLimit)
• Implements Use the new PackedUserOperation struct with packed gas fields from entrypoint 0.7.0 #225

Forked contracts repo with build artifacts: https://github.com/5afe/account-abstraction
More about 0.7.0 changes: #215

Issues/concerns:

• Using unaudited non-release candidate contract versions
• The reference bundler is still in development, thus e2e tests are failing (Confirmed with ERC4337 team)

[coveralls]

Pull Request Test Coverage Report for Build 7870582983

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.923%

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Totals
Change from base Build 7842856737:	0.0%
Covered Lines:	131
Relevant Lines:	155

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💛 - Coveralls

[mmv08]

This and other formatting/linting-related changes were needed to fix the failing CI job. The problem was conflicting eslint-prettier-plugin rules and prettier itself due to misconfiguration.

TLDR: For linting and formatting javascript/typescript code, we use eslint-plugin-prettier, which runs prettier as ESLint rules. For checking formatting, we use a standalone prettier package instead. After updating dependencies, they introduced conflicting rules. So, ESLint would say that prettier's formatting needs to be corrected and vice versa. To fix this, I updated the prettier script to only format solidity files in the 4337 module and added the examples directory to .prettierignore for the global check (since the only app there uses eslint for formatting as well)

[nlordell]

Closing in favor of #245

[nlordell]

Re-opening, as we want to potentially include this to an entrypoint/v0.7 feature branch.

[nlordell]

Merging with failing E2E tests (see PR description).