Add copy functionality and clone routines

[jeffreylovitz]

This PR adds support for the Redis COPY command.

[codecov[bot]]

Codecov Report

Merging #2189 (a919d55) into master (38bbc25) will decrease coverage by 0.86%. The diff coverage is 20.71%.

:exclamation: Current head a919d55 differs from pull request most recent head ffaf323. Consider uploading reports for the commit ffaf323 to get more accurate results

@@            Coverage Diff             @@
##           master    #2189      +/-   ##
==========================================
- Coverage   93.08%   92.22%   -0.87%     
==========================================
  Files         253      251       -2     
  Lines       22657    22689      +32     
==========================================
- Hits        21090    20924     -166     
- Misses       1567     1765     +198     

Impacted Files	Coverage Δ
src/graph/entities/graph_entity.c	48.27% <0.00%> (-2.82%)	:arrow_down:
src/graph/entities/node.c	0.00% <ø> (ø)
src/graph/graph.c	96.27% <0.00%> (-3.03%)	:arrow_down:
src/graph/graph_statistics.c	82.14% <0.00%> (-17.86%)	:arrow_down:
src/graph/graph_statistics.h	100.00% <ø> (ø)
src/graph/graphcontext.c	89.67% <0.00%> (-7.83%)	:arrow_down:
src/schema/schema.c	88.88% <0.00%> (-3.62%)	:arrow_down:
src/util/datablock/datablock.c	79.38% <8.69%> (-16.23%)	:arrow_down:
src/serializers/graphcontext_type.c	79.06% <16.66%> (-10.12%)	:arrow_down:
src/index/index.c	88.62% <20.83%> (-7.77%)	:arrow_down:
... and 100 more

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[swilly22]

@jeffreylovitz I've started refactoring some of the logic, can you please review my changes and address the TODO comments ?

[swilly22]

#1076 #2366

[CLAassistant]

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