Add psalm

[fjorgemota]

Changes Proposed in this Pull Request

• Add Psalm static analysis tool

Testing Instructions

• Check if the action for psalm are running fine
• Run composer install
• Play with the code, using mixed on the code as return type, etc.
• Run ./vendor/bin/psalm --php-version=7.4 to check if it catches errors on PHP 7.4
• Run ./vendor/bin/psalm --php-version=8.2 to check if it catches errors on PHP 8.2

Release Notes

Discussion

The related post for discussion is p6r3EZ-21n-p2

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