Geo paths cannot be colorized

It works for 2 point lines only:

```
df = gpd.GeoDataFrame({'mission': ['A','B']}, geometry=[
shapely.geometry.LineString([(0,0), (1,0)]),
shapely.geometry.LineString([(0,0), (1,1)]),
])
df.hvplot(geo=True, c='mission')
```

But it doesn't work for 3+ point lines:
```
df = gpd.GeoDataFrame({'mission': ['A','B']}, geometry=[
shapely.geometry.LineString([(0,0), (1,0), (1,1)]),
shapely.geometry.LineString([(0,0), (1,1), (0,1)]),
])
df.hvplot(geo=True, c='mission')

BokehUserWarning: ColumnDataSource's columns must be of the same length. Current lengths: ('color', 1), ('mission', 4), ('xs', 4), ('ys', 4)
```

Sure, in the real life we have longer than 2 point lines and hvplot is broken for them. That looks totally useless to limit line size to just 2 points. Obviously, there is no limitation in Matplotlib:

```
df = gpd.GeoDataFrame({'mission': ['A','B']}, geometry=[
shapely.geometry.LineString([(0,0), (1,0), (1,1)]),
shapely.geometry.LineString([(0,0), (1,1), (0,1)]),
])
df.plot(cmap='jet')
```