Don't pass blindly what comes from the API to Fuse

Since now we have an internal `Fuse` type that uses quantities to avoid
bugs, we need to make sure to properly convert between the client's
`Fuse` type and the internal one.

There is also actually a bug in the old code, as the conversion to
`Current` never happened. This was never caught by `mypy` because we
were using the `**args` syntax to create the object, so there is no
type checking of the arguments, so a bad `Fuse` was being created, with
a `float` `max_current` instead of using `Current`.

We now make sure the conversion is done appropriately.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/sdk/timeseries/grid.py

@@ -195,8 +195,10 @@ def initialize(
         # instead of the expected ComponentMetadata type.
         metadata = grid_connections[0].metadata
         if isinstance(metadata, dict):
-            fuse_dict = metadata.get("fuse", None)
-            fuse = Fuse(**fuse_dict) if fuse_dict else None
+            if fuse_dict := metadata.get("fuse", None):
+                fuse = Fuse(
+                    max_current=Current.from_amperes(fuse_dict.get("max_current", 0.0))
+                )
 
         if fuse is None:
             _logger.warning("The grid connection point does not have a fuse")