Projections added to python client

[RobHam99]

project method added to map.py, projection.py added including IdentityProjection, SingleAttributeProjection and MultiAttributeProjection.

Closes #203

[devOpsHazelcast]

Can one of the admins verify this patch?

[devOpsHazelcast]

Can one of the admins verify this patch?

[codecov-commenter]

Codecov Report

Merging #451 (265aad1) into master (4753b54) will increase coverage by 8.14%.
The diff coverage is 92.45%.

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
+ Coverage   86.06%   94.20%   +8.14%     
==========================================
  Files         340      345       +5     
  Lines       17938    17545     -393     
==========================================
+ Hits        15438    16529    +1091     
+ Misses       2500     1016    -1484     

Impacted Files	Coverage Δ
hazelcast/core.py	94.48% <75.00%> (+2.70%)	⬆️
hazelcast/projection.py	87.50% <87.50%> (ø)
hazelcast/proxy/map.py	88.83% <93.33%> (+15.45%)	⬆️
hazelcast/protocol/codec/map_project_codec.py	100.00% <100.00%> (ø)
...protocol/codec/map_project_with_predicate_codec.py	100.00% <100.00%> (ø)
hazelcast/serialization/serialization_const.py	100.00% <100.00%> (ø)
hazelcast/serialization/serializer.py	96.01% <100.00%> (+6.33%)	⬆️
hazelcast/serialization/service.py	96.73% <100.00%> (+36.91%)	⬆️
hazelcast/reactor.py	79.56% <0.00%> (-4.65%)	⬇️
... and 59 more

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[mdumandag]

Looks pretty code, left some more minor comments

[mdumandag]

verify

[mdumandag]

@RobHam99 a test failed in Python 2. To fix this, we need to define __hash__ for HazelcastJsonValue.

Please add the following methods to hazelcast/core.py/HazelcastJsonValue class

    def __hash__(self):
        return hash(self._json_string)

    def __repr__(self):
        return self._json_string

[mdumandag]

verify

[mdumandag]

Thanks a lot for the contribution Rob, I am merging this