Add Redis Graph module (GRAPH.QUERY, GRAPH.SLOWLOG)

[mikhail-vl]

Add support for Redis Graph commands:

1. Graph.Query: https://oss.redislabs.com/redisgraph/commands/#graphquery
2. Graph.SLOWLOG: https://oss.redislabs.com/redisgraph/commands/#graphslowlog

Graph.Query command should return 2 data frame with nodes and edges: https://grafana.com/docs/grafana/latest/panels/visualizations/node-graph/

Command examples:

1. GRAPH.QUERY GOT_DEMO "MATCH (w:writer)-[wrote]->(b:book) return w,b"
2. GRAPH.QUERY MotoGP "MATCH (r:Rider)-[:rides]->(t:Team {name:'Ducati'}) RETURN r,t"

Redis Data Type 7.4 dashboard has Node Graph panel for GOT_DEMO key.

[codecov]

Codecov Report

Merging #157 (b7b62fb) into master (3e20888) will increase coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   93.50%   93.89%   +0.38%     
==========================================
  Files          32       33       +1     
  Lines        1293     1375      +82     
  Branches       67       67              
==========================================
+ Hits         1209     1291      +82     
  Misses         74       74              
  Partials       10       10              

Impacted Files	Coverage Δ
src/redis/command.ts	100.00% <ø> (ø)
pkg/query.go	95.12% <100.00%> (+0.25%)	⬆️
pkg/redis-graph.go	100.00% <100.00%> (ø)
src/redis/query.ts	100.00% <100.00%> (ø)

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[mikhail-vl]

Looks good!