[GA-153-1] Implement EdgeAttrDict update method (new)

[hkernbach]

This PR replaces: #15

[aMahanna]

@hkernbach I'm just realizing now that in order for users to do something like this:

G.adj.update(...)

We'll need to create a CustomAdjacencyView that inherits from this: https://github.com/networkx/networkx/blob/main/networkx/classes/coreviews.py#L66-L85

So similar to the setup we have for CustomNodeView: https://github.com/arangodb/nx-arangodb/blob/main/nx_arangodb/classes/reportviews.py#L13-L22

NetworkX doesn't recommend users to directly access the _node or _adj objects directly, so we'll need to provide these custom views to act as wrappers around the update methods we're introducing

This will warrant creating a coreviews.py file in nx_arangodb/classes

[hkernbach]

@hkernbach I'm just realizing now that in order for users to do something like this:

G.adj.update(...)

We'll need to create a CustomAdjacencyView that inherits from this: https://github.com/networkx/networkx/blob/main/networkx/classes/coreviews.py#L66-L85

So similar to the setup we have for CustomNodeView: https://github.com/arangodb/nx-arangodb/blob/main/nx_arangodb/classes/reportviews.py#L13-L22

NetworkX doesn't recommend users to directly access the _node or _adj objects directly, so we'll need to provide these custom views to act as wrappers around the update methods we're introducing

This will warrant creating a coreviews.py file in nx_arangodb/classes

Please let's discuss this next. This is not yet clear to me

[aMahanna]

could we extract this boolean check out of the double for loop given that graph_type is constant throughout this function?

[hkernbach]

done in da332e0