Fast Aggregations

[RobHam99]

Added aggregators for: count, double average, double sum, number average, fixed point sum, floating point sum, max, min, integer average, integer sum, long average and long sum. Also updated documentation with example of aggregator use.

[devOpsHazelcast]

Can one of the admins verify this patch?

[devOpsHazelcast]

Can one of the admins verify this patch?

[devOpsHazelcast]

All committers have signed the CLA.

[mdumandag]

verify

[codecov-commenter]

Codecov Report

Merging #442 (0bd0fa1) into master (7d796f2) will decrease coverage by 0.14%.
The diff coverage is 93.22%.

@@            Coverage Diff             @@
##           master     #442      +/-   ##
==========================================
- Coverage   86.62%   86.47%   -0.15%     
==========================================
  Files         336      340       +4     
  Lines       17398    17579     +181     
==========================================
+ Hits        15071    15202     +131     
- Misses       2327     2377      +50     

Impacted Files	Coverage Δ
...st/protocol/codec/count_down_latch__await_codec.py	61.90% <61.90%> (ø)
hazelcast/proxy/map.py	73.32% <90.00%> (-0.06%)	⬇️
hazelcast/aggregator.py	97.39% <97.39%> (ø)
hazelcast/protocol/codec/map_aggregate_codec.py	100.00% <100.00%> (ø)
...otocol/codec/map_aggregate_with_predicate_codec.py	100.00% <100.00%> (ø)
hazelcast/reactor.py	77.51% <0.00%> (-6.70%)	⬇️
hazelcast/listener.py	68.60% <0.00%> (-1.17%)	⬇️
hazelcast/invocation.py	80.52% <0.00%> (-0.75%)	⬇️
hazelcast/connection.py	82.35% <0.00%> (-0.57%)	⬇️
... and 4 more

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[mdumandag]

Congrats @RobHam99, the PR looks really great!
I left generally documentation-related comments.
Can you also add a code sample for it? Similar to this one https://github.com/hazelcast/hazelcast-nodejs-client/blob/master/code_samples/aggregation.js.

You can take a look at other code samples at this repo to see the structure we use

[mdumandag]

Thanks a lot for your effort and patience @RobHam99. Working with you was a really smooth experience.
Let me run the tests again and after that merge the PR, if everything is okay

[mdumandag]

verify