Graphql helper

[miratepuffin]

What changes were proposed in this pull request?

• Tided up graphql pytests as having a single file was driving me mad
• Broke the graphql python module into smaller files
• Exposed delete on edge in python
• Fixed missing DTime parsing on Python properties
• Added RemoteGraph, RemoteNode and RemoteEdge classes to wrap updates to graph on a server
• Added below functions with tests to these classes
• Made Properties options in add_updates for Node and Edge in Graphql
• Added some helper functions in make for formatting rust/python, building docs and building python
• fixed a bug in batch add nodes, where you couldn't just add the node_type.
• Fixed a bug in import_node(s)/import_edge(s) when the graph is indexed with ints

Functions added

• new_graph
• client.graph(path=).add_node()
• client.graph(path=).add_nodes()
• client.graph(path=).add_edge()
• client.graph(path=).add_edges()
• client.graph(path=).delete_edge()
• client.graph(path=).add_properties()
• client.graph(path=).add_constant_properties()
• client.graph(path=).update_constant_properties()
• client.graph(path=).node(name=).add_constant_properties()
• client.graph(path=).node(name=).set_node_type()
• client.graph(path=).node(name=).update_constant_properties()
• client.graph(path=).node(name=).add_updates()
• client.graph(path=).edge(src=,dst=).delete()
• client.graph(path=).edge(src=,dst=).add_constant_properties()
• client.graph(path=).edge(src=,dst=).update_constant_properties()
• client.graph(path=).edge(src=,dst=).add_updates()

Why are the changes needed?

Dealing with graphql strings in python is a pain

Does this PR introduce any user-facing change? If yes is this documented?

yes and yes

How was this patch tested?

New tests added for each function

Issues

fixes #1723

[ljeub-pometry]

The APIs look good, the Jinja templating for the queries is questionable but we can find a better solution for that later as we expand the RemoteGraph functionality. Some docstrings need a bit of cleanup.