VersionLayerClient adding GetAggregatedData API

[kzvieriev]

New API fetches data of a tile or its closest ancestor. It can be useful
when need to load most detailed available data for specified tile. Added
integration tests to cover the API.

Resolves: OLPEDGE-1932

Signed-off-by: Kostiantyn Zvieriev ext-kostiantyn.zvieriev@here.com

[codecov]

Codecov Report

Merging #891 into master will increase coverage by 0.2%.
The diff coverage is 98.0%.

@@ Coverage Diff @@## master #891 +/- ##
========================================
+ Coverage 81.1% 81.2% +0.2% 
========================================
Files 295 302 +7 Lines 10477 10573 +96 ========================================
+ Hits 8494 8589 +95 - Misses 1983 1984 +1 

Impacted Files	Coverage Δ
...nclude/olp/dataservice/read/VersionedLayerClient.h	100.0% <ø> (ø)
...-dataservice-read/src/VersionedLayerClientImpl.cpp	91.8% <97.4%> (+0.9%)	⬆️
...nclude/olp/dataservice/read/AggregatedDataResult.h	100.0% <100.0%> (ø)
...-sdk-dataservice-read/src/VersionedLayerClient.cpp	94.3% <100.0%> (+0.7%)	⬆️
...pp-sdk-authentication/src/AuthenticationClient.cpp	75.9% <0.0%> (-4.2%)	⬇️
olp-cpp-sdk-authentication/src/TokenEndpoint.cpp	89.1% <0.0%> (-0.2%)	⬇️
...e-read/src/generated/parser/VersionInfosParser.cpp	100.0% <0.0%> (ø)
...ude/olp/dataservice/read/model/VersionDependency.h	100.0% <0.0%> (ø)
.../include/olp/dataservice/read/model/VersionInfos.h	100.0% <0.0%> (ø)
...k-authentication/src/AuthenticationClientUtils.cpp	96.9% <0.0%> (ø)
... and 5 more

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