CAEN imrange getter and setter datatypes are now consistent (#37)

* CAEN imrange getter and setter datatypes are now consistent

* Update CAEN imrange setter and getter type hints

---------

Co-authored-by: Luis Antonio Obis Aparicio <35803280+lobis@users.noreply.github.com>

src/hvps/devices/caen/channel.py

@@ -150,7 +150,7 @@ def imon(self) -> float:
         return float(response)
 
     @property
-    def imrange(self) -> bool:
+    def imrange(self) -> str:
         response = _write_command(
             ser=self._serial,
             logger=self._logger,
@@ -159,7 +159,7 @@ def imrange(self) -> bool:
         )
         if response not in ["HIGH", "LOW"]:
             raise ValueError(f"Unexpected response {response}")
-        return response == "HIGH"
+        return response
 
     @property
     def imdec(self) -> int:
@@ -485,7 +485,8 @@ def pdwn(self, value: float) -> None:
             raise ValueError(f"Could not set PDWN to {value}")
 
     @imrange.setter
-    def imrange(self, value: float) -> None:
+    def imrange(self, value: str) -> None:
+        """Set channel to "HIGH" or "LOW" current monitor mode"""
         _write_command(
             ser=self._serial,
             logger=self._logger,