ref: Add/Sub Assignment Operations + e2e-tests.sh

[0xNeshi]

Resolves #445, Resolves #444

PR Checklist

• Tests
• Documentation
• Changelog

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.6%. Comparing base (3205fc7) to head (c5c7be5).
Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
contracts/src/access/control.rs	98.5% <ø> (ø)
contracts/src/access/ownable.rs	94.1% <ø> (ø)
contracts/src/access/ownable_two_step.rs	99.2% <ø> (ø)
contracts/src/finance/vesting_wallet.rs	55.6% <ø> (ø)
...racts/src/token/erc1155/extensions/metadata_uri.rs	78.5% <ø> (ø)
contracts/src/token/erc1155/extensions/supply.rs	81.1% <ø> (ø)
...tracts/src/token/erc1155/extensions/uri_storage.rs	98.2% <ø> (ø)
contracts/src/token/erc1155/mod.rs	96.9% <ø> (ø)
contracts/src/token/erc20/extensions/capped.rs	83.3% <ø> (ø)
contracts/src/token/erc20/extensions/metadata.rs	22.2% <ø> (ø)
... and 12 more

[bidzyyys]

I believe we can apply #[allow(clippy::used_underscore_binding)] for the whole contracts library

[bidzyyys]

Left some comments, good job @0xNeshi

[bidzyyys]

Almost ready to merge!

[bidzyyys]

LGTM!

[qalisander]

Good job!

[qalisander]

LGTM

[bidzyyys]

LGTM! 🚀