• Applied ECS formatting to all code

Full list of changes

• Upgraded PHPStan to v2
• Added PHP8.4 to CI workflow
• Made PHP8.4 minimum version

• Fixed implicit nullable arguments
• Added @phpstan-require-implements constraints
• Made PHP8.1 minimum version

• Converted phpstan doc comments to generic
• Migrated to use effigy in CI workflow
• Fixed PHP8.1 testing

• Added Cast interface
• Updated composer check script

• Added static instance check in instance()

• Added SingleParameterFactory interface
• Updated CI environment

• Removed PHP7 compatibility
• Updated ECS to v11
• Updated PHPUnit to v9

• Transitioned from Travis to GHA
• Updated PHPStan and ECS dependencies

• Enabled PHP8 testing