refactor: Rename Read to ReadImage

[serena-ruan]

To avoid possible name duplicates with .NET MLReadable functions, rename Read class to ReadImage class.

[serena-ruan]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[serena-ruan]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #1163 (1feb7f0) into master (448f893) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1163      +/-   ##
==========================================
- Coverage   83.82%   83.81%   -0.01%     
==========================================
  Files         259      259              
  Lines       12414    12414              
  Branches      647      647              
==========================================
- Hits        10406    10405       -1     
- Misses       2008     2009       +1     

Impacted Files	Coverage Δ
.../microsoft/ml/spark/cognitive/ComputerVision.scala	79.08% <100.00%> (+0.51%)	⬆️
...a/com/microsoft/ml/spark/io/http/HTTPClients.scala	56.66% <0.00%> (-3.34%)	⬇️
...microsoft/ml/spark/cognitive/SpeechToTextSDK.scala	87.07% <0.00%> (-0.77%)	⬇️
...rosoft/ml/spark/stages/PartitionConsolidator.scala	95.74% <0.00%> (+2.12%)	⬆️
...com/microsoft/ml/spark/core/utils/AsyncUtils.scala	70.00% <0.00%> (+5.00%)	⬆️

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