[v0.0.6-rc8] pre-deployment

What's Changed

• Audit reverts by @yorhodes in #82
• Pausable ISM by @nambrot in #84
• Allow threshold == set size and add tests by @nambrot in #85
• Do not revert on dispatch due to excess funds by @yorhodes in #86
• fix: coverage by @byeongsu-hong in #87
• Make domain hash use left padded mailbox addresses by @yorhodes in #88
• Implement simple protocol fee hook by @yorhodes in #89
• fix: remove redundant protobuf by @byeongsu-hong in #90
• feat: use optimizer by @byeongsu-hong in #92
• Add mailbox unit tests for post dispatch by @yorhodes in #91
• fix: pr and test by @byeongsu-hong in #93
• feat: testnet deployment by @byeongsu-hong in #94

New Contributors

• @yorhodes made their first contribution in #82

Full Changelog: v0.0.6-rc7...v0.0.6-rc8