Remove accelerator_value oneof in core.ResourceMetadata

[jeevb]

Addresses: #419 (comment)

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +2.55% 🎉

Comparison is base (ef37788) 75.92% compared to head (ce14edd) 78.48%.

❗ Current head ce14edd differs from pull request most recent head 18af7aa. Consider uploading reports for the commit 18af7aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #442      +/-   ##
==========================================
+ Coverage   75.92%   78.48%   +2.55%     
==========================================
  Files          18       18              
  Lines        1458     1250     -208     
==========================================
- Hits         1107      981     -126     
+ Misses        294      212      -82     
  Partials       57       57              

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see 18 files with indirect coverage changes

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