Added GPU IndexTypes to support Milvus-GPU

[luisfmnunes]

Added the GPU index types as metioned in Issue #257

[sre-ci-robot]

Welcome @luisfmnunes! It looks like this is your first PR to milvus-io/milvus-sdk-cpp 🎉

[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (e90aa2f) 97.33% compared to head (30ff077) 97.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
- Coverage   97.33%   97.19%   -0.15%     
==========================================
  Files          34       34              
  Lines        2628     2637       +9     
==========================================
+ Hits         2558     2563       +5     
- Misses         70       74       +4     

Files	Coverage Δ
src/impl/types/IndexDesc.cpp	98.88% <100.00%> (+0.01%)	:arrow_up:
src/impl/TypeUtils.cpp	97.80% <50.00%> (-0.61%)	:arrow_down:

[matrixji]

/lgtm

[matrixji]

/label ci-pass

[sre-ci-robot]

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In response to this:

/label ci-pass

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[matrixji]

@luisfmnunes could you try to fix the clang-format issue with make clang-format in the build directory? I could not directly merge your PR until you fix the format issue.

[sre-ci-robot]

New changes are detected. LGTM label has been removed.

[sre-ci-robot]

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[luisfmnunes]

@luisfmnunes could you try to fix the clang-format issue with make clang-format in the build directory? I could not directly merge your PR until you fix the format issue.

Sorry about that, seems like I messed up the identation somewhere and it was crashing clang build. I pushed a commit after running clang-format

[matrixji]

/lgtm

[matrixji]

@luisfmnunes sorry for handling this late, could you rebase your branch, then the codecov may pass, as I just update the codecov patch coverage target.