feat: add KeyRegistry

[horsefacts]

Motivation

Implements FIP: Onchain Signers, fixing #255.

Change Summary

• Adds a Key Registry contract as specified by the draft FIP
• Initializes contracts with an owner
• Updates default vscode settings to use solidity 0.8.19

Merge Checklist

Choose all relevant options below by adding an x now or at any time before submitting for review

• [x] The PR title adheres to the conventional commits standard
• [x] The PR has been tagged with change type label(s) (i.e. documentation, feature, bugfix, or chore)
• [x] The PR's changes adhere to all the requirements in the contribution guidelines
• [x] This PR does not require changes to the Farcaster protocol

Additional Context

Also closes #258

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PR-Codex overview

This PR focuses on adding an owner parameter to the constructors of IdRegistry, FnameResolver, Bundler, and KeyRegistry contracts. It also updates the test suites and harnesses accordingly.

Detailed summary

• Added owner parameter to the constructors of IdRegistry, FnameResolver, Bundler, and KeyRegistry.
• Updated test suites and harnesses to pass the owner parameter.
• Updated the deployment script to use the new constructor syntax for IdRegistry.
• Updated the FnameResolver test to check the initial owner.
• Updated the KeyRegistry contract with new functionality and events.

The following files were skipped due to too many changes: src/KeyRegistry.sol, test/KeyRegistry/KeyRegistry.t.sol

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[github-actions[bot]]

Coverage after merging horsefacts/signer-registry into main will be

98.13%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Bundler.sol	100%	100%	100%	100%
FnameResolver.sol	96.30%	75%	100%	100%	122
IdRegistry.sol	100%	100%	100%	100%
KeyRegistry.sol	100%	100%	100%	100%
StorageRent.sol	98.90%	98.48%	100%	98.96%	519, 521
src/lib
TransferHelper.sol	0%	0%	0%	0%	15, 15, 15, 25–26, 26, 26