Throw `InvalidArgumentException` when missed "one" plural key + Fix psalm

PR Summary

Enhanced Workflow Triggers Addition of master branch to the push event trigger. This allows actions to be automatically run in GitHub workflows whenever code is pushed to the master branch.
Enhanced Error Handling Enhanced issue #131 by throwing an InvalidArgumentException to provide clear, concise information when invalid arguments are used.
Dependency Upgrades Updated core testing library phpunit/phpunit, enhanced code quality checker vimeo/psalm, and included the configuration file psalm80.xml to setup project with the latest versions.
Enhanced Code Quality Checks Added <issueHandlers> element and suppressed error levels for specified tests in psalm.xml to reduce noise in code quality reports.
Code Quality Configuration Added psalm80.xml with configurations and rules to maintain high-quality code according to the standards of Psalm version 80.
Improved Message Formatting A new check in SimpleMessageFormatter.php was added to ensure the validity of the message format and throw an InvalidArgumentException if key parts are missing.
Improved Test Names Renamed a test method to better communicate its purpose, increasing readability of tests.
New Test Method Added New test method to check specific key existence to ensure robustness of code against unusual cases.