Add nperiods property to Driver

This will just add the possibility to configure the number of periods
used by the underlying soundcard. This can be especially helpfull when
tailoring performance on jittery systems.

src/jack_server/_driver.py

@@ -49,5 +49,13 @@ def period(self) -> int:
     def period(self, __value: int) -> None:
         self.params["period"].value = __value
 
+    @property
+    def nperiods(self) -> int:
+        return cast(int, self.params["nperiods"].value)
+
+    @nperiods.setter
+    def nperiods(self, __value: int) -> None:
+        self.params["nperiods"].value = __value
+
     def __repr__(self) -> str:
         return f"<jack_server.Driver name={self.name}>"

src/jack_server/_server.py

@@ -51,6 +51,7 @@ def __init__(
         device: str | SetByJack = SetByJack_,
         rate: SampleRate | SetByJack = SetByJack_,
         period: int | SetByJack = SetByJack_,
+        nperiods: int | SetByJack = SetByJack_,
     ) -> None:
         self._created = False
         self._opened = False
@@ -73,6 +74,8 @@ def __init__(
             self.driver.rate = rate
         if not isinstance(period, SetByJack):
             self.driver.period = period
+        if not isinstance(nperiods, SetByJack):
+            self.driver.nperiods = nperiods
 
     def _create(
         self,