Add record keys support.

src/atpasser/recordKeys/__init__.py

···
+class RecordKey:
+    """
+    A class representing a RecordKey.
+
+
+    Attributes:
+        recordKey (str): The RecordKey URI.
+    """
+
+    def __init__(self, recordKey: str) -> None:
+        """
+        Initalizes an RecordKey object.
+
+        Parameters:
+            recordKey (str): The RecordKey.
+        """
+
+        if recordKey == "" or len(recordKey) > 512:
+            raise ValueError("null record key or record key longer than 512 chars")
+
+        if recordKey == ".." or recordKey == ".":
+            raise ValueError("reserved value . and ..")
+
+        if not set(recordKey).issubset(
+            set("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_:~")
+        ):
+            raise ValueError("invalid char")
+
+        self.recordKey = recordKey
+
+    def __str__(self) -> str:
+        """
+
+        Convert the RecordKey to a string by given the URI.
+        """
+        return self.recordKey
+
+    def __eq__(self, value: object, /) -> bool:
+        """
+
+        Check if the 2 values are exactly the same.
+        """
+
+        if isinstance(value, RecordKey):
+
+            return str(self) == str(value)
+        else:
+
+            raise TypeError