Add Missing Portable Read/Write Functions [API-1014]

[mehmettokgoz]

Currently, the read and write functions for decimal, time, date, timestamp, timestamp_with_timezone types are missing for Portable serialization. This PR implements them and adds related tests.

Changes

• Functions are introduced to API in api.py
• Field type numbers are added for the class definition following the sequential order.
• Implemented nullable read and write functions for these types, porting the Java client functions: DefaultPortableWriter.java#L198 and DefaultPortableReader.java#L141.
• Since the R/W functions are not the same for Portable and other serialization methods, special ones are implemented for Portable using portable infix in function names. (writer.py#L250 and reader.py#L360)
• New types are included in Portable unit tests.
• No documentation change is required.

[codecov-commenter]

Codecov Report

Merging #569 (d641840) into master (06a48e8) will increase coverage by 0.03%. The diff coverage is 98.69%.

@@            Coverage Diff             @@
##           master     #569      +/-   ##
==========================================
+ Coverage   96.47%   96.50%   +0.03%     
==========================================
  Files         355      348       -7     
  Lines       20351    19794     -557     
==========================================
- Hits        19633    19103     -530     
+ Misses        718      691      -27     

Impacted Files	Coverage Δ
hazelcast/serialization/portable/writer.py	93.39% <95.23%> (+0.67%)	:arrow_up:
hazelcast/serialization/api.py	100.00% <100.00%> (ø)
hazelcast/serialization/portable/classdef.py	92.00% <100.00%> (+1.72%)	:arrow_up:
hazelcast/serialization/portable/reader.py	95.29% <100.00%> (+0.64%)	:arrow_up:
hazelcast/proxy/map.py	97.82% <0.00%> (-0.43%)	:arrow_down:
hazelcast/util.py
hazelcast/proxy/cp/__init__.py
hazelcast/client.py
hazelcast/proxy/__init__.py
hazelcast/compact.py
... and 7 more

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