Use porting::optional in olp-cpp-sdk-read 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 third part of the task: olp-cpp-sdk-read.

Relates-To: NLAM-23

[codecov]

Codecov Report

❌ Patch coverage is 91.86992% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.27%. Comparing base (ba2156c) to head (cb9c5b2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ataservice-read/src/repositories/QuadTreeIndex.cpp	60.00%	4 Missing ⚠️
...dataservice-read/src/generated/api/MetadataApi.cpp	50.00%	3 Missing ⚠️
...ce-read/include/olp/dataservice/read/DataRequest.h	86.67%	2 Missing ⚠️
...d/include/olp/dataservice/read/PartitionsRequest.h	83.33%	2 Missing ⚠️
...e/olp/dataservice/read/PrefetchPartitionsRequest.h	71.43%	2 Missing ⚠️
...read/include/olp/dataservice/read/CatalogRequest.h	85.71%	1 Missing ⚠️
...clude/olp/dataservice/read/CatalogVersionRequest.h	87.50%	1 Missing ⚠️
...nclude/olp/dataservice/read/PrefetchTilesRequest.h	91.67%	1 Missing ⚠️
...ce-read/include/olp/dataservice/read/TileRequest.h	88.89%	1 Missing ⚠️
olp-cpp-sdk-dataservice-read/src/TaskSink.h	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1627      +/-   ##
==========================================
- Coverage   80.32%   80.27%   -0.06%     
==========================================
  Files         349      349              
  Lines       13946    13952       +6     
  Branches     1492     1493       +1     
==========================================
- Hits        11202    11199       -3     
- Misses       2146     2152       +6     
- Partials      598      601       +3     

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