Use porting::optional in olp-cpp-sdk-write instead of boost::optional.

[asopov-here]

Currently, SDK requires C++11 minimum.
So, boost::optional type is used for optional values. For C++17 and above more convenient is to use std::optional instead. The task NLAM-23 is about making this type configurable. This commit is a second part of the task: olp-cpp-sdk-write.

Relates-To: NLAM-23

[codecov]

Codecov Report

❌ Patch coverage is 45.90164% with 99 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.29%. Comparing base (cbf2c46) to head (c555d6f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...-dataservice-write/src/VolatileLayerClientImpl.cpp	20.00%	16 Missing ⚠️
...dk-dataservice-write/src/generated/MetadataApi.cpp	0.00%	13 Missing ⚠️
...dataservice-write/src/VersionedLayerClientImpl.cpp	29.41%	12 Missing ⚠️
...p-sdk-dataservice-write/src/generated/QueryApi.cpp	10.00%	9 Missing ⚠️
...-sdk-dataservice-write/src/generated/IngestApi.cpp	38.46%	8 Missing ⚠️
...sdk-dataservice-write/src/generated/PublishApi.cpp	0.00%	8 Missing ⚠️
...-sdk-dataservice-write/src/generated/ConfigApi.cpp	30.00%	7 Missing ⚠️
...p-sdk-dataservice-write/src/generated/IndexApi.cpp	0.00%	5 Missing ⚠️
...erated/serializer/UpdateIndexRequestSerializer.cpp	0.00%	5 Missing ⚠️
...pp-sdk-dataservice-write/src/generated/BlobApi.cpp	33.33%	4 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1626      +/-   ##
==========================================
- Coverage   80.29%   80.29%   -0.00%     
==========================================
  Files         349      349              
  Lines       13941    13944       +3     
  Branches     1492     1491       -1     
==========================================
+ Hits        11193    11195       +2     
- Misses       2148     2150       +2     
+ Partials      600      599       -1     

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[rustam-gamidov-here]

it make sense to give PR's name depending on the content, not very hard but will make it easier to find something in future