[api] Adds base64 image support for ImageTranslator

[frankfliu]

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 36.36364% with 21 lines in your changes missing coverage. Please review.

Project coverage is 58.48%. Comparing base (5c418be) to head (adc5632).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
...modality/cv/translator/ImageServingTranslator.java	0.00%	19 Missing ⚠️
...cv/translator/wrapper/StringImagePreProcessor.java	60.00%	2 Missing ⚠️

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HEAD has 1 upload less than BASE

Flag	BASE (5c418be)	HEAD (adc5632)
	2	1

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3456       +/-   ##
=============================================
- Coverage     72.57%   58.48%   -14.10%     
+ Complexity     7377     5804     -1573     
=============================================
  Files           669      672        +3     
  Lines         32658    32817      +159     
  Branches       3474     3489       +15     
=============================================
- Hits          23701    19192     -4509     
- Misses         7319    12150     +4831     
+ Partials       1638     1475      -163     

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