Load existing graph from JSON

[yampelo]

import json
from beagle.datasources import SysmonEVTX
from beagle.backends import NetworkX

# Get back a nx.MultiDiGraph object
graph = SysmonEVTX("malicious.evtx").to_graph()

# Convert the object to JSON
graph_json = NetworkX.graph_to_json(graph)

with open("my_graph.json", "w") as f:
    json.dump(graph_json, f)

# Later on:
# G is the same nx.MultiDiGraph object generated by `.to_graph()`
G = NetworkX.from_json("my_graph.json")

Closes #64

[codecov]

Codecov Report

Merging #69 into master will increase coverage by 0.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #69     +/-   ##
=========================================
+ Coverage   78.25%   78.46%   +0.2%     
=========================================
  Files          56       56             
  Lines        2677     2703     +26     
=========================================
+ Hits         2095     2121     +26     
  Misses        582      582

Impacted Files	Coverage Δ
beagle/backends/networkx.py	97.61% <100%> (+0.84%)	⬆️
beagle/transformers/sysmon_transformer.py	97.61% <100%> (-0.19%)	⬇️
beagle/nodes/file.py	97.67% <100%> (+0.11%)	⬆️
beagle/backends/__init__.py	100% <100%> (ø)	⬆️
beagle/nodes/process.py	100% <100%> (ø)	⬆️
beagle/nodes/__init__.py	100% <100%> (ø)	⬆️

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