explicitly define init of BaseProvider (#1972)

XarrayEDRProvider was initializing XarrayProvider twice- once through the BaseEDRProvider due to MRO and once explicitly. this slowed down the initialization since the XarrayProvider was called twice (which causes all datasets to be lazy loaded twice).

Author: sjordan29

pygeoapi/provider/base_edr.py

@@ -52,7 +52,7 @@ def __init__(self, provider_def):
         :returns: pygeoapi.provider.base_edr.BaseEDRProvider
         """
 
-        super().__init__(provider_def)
+        BaseProvider.__init__(self, provider_def)
 
 #        self.instances = []