Version 2.0.0

• Enh #90, 91: Use 1 file path argument for storages (@arogachev)
• Chg #63, #76: Raise PHP version to 8.1 (@arogachev)
• Enh #50: Save Assignment::$createdAt (@arogachev)
• Enh #51: Save Item::$createdAt and Item::$updatedAt (@arogachev)
• Enh #52: Handle concurrency when working with storages (@arogachev)
• Enh #63: Improve performance (@arogachev)
• Enh #70, #94: Sync with base package (implement interface methods) (@arogachev)
• Enh #76: Use simple storages for items and assignments from the base rbac package (@arogachev)
• Enh #77: Use snake case for item attribute names (ease migration from Yii 2) (@arogachev)
• Enh #87: Move handling same names during renaming item in AssignmentsStorage to base package (@arogachev)