[MINOR] fix(tez): Add output mapOutputRecordCounter metrics

[bin41215]

What changes were proposed in this pull request?

Add output mapOutputRecordCounter metrics

Why are the changes needed?

Add this metrics to fix reducing the number of tasks

Fix: #972

Does this PR introduce any user-facing change?

No.

How was this patch tested?

ut

[jerqi]

@zhengchenyu Could you help me review this pr?

[jerqi]

LGTM

[codecov-commenter]

Codecov Report

Merging #1093 (4495f81) into master (1411376) will increase coverage by 1.16%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1093      +/-   ##
============================================
+ Coverage     54.07%   55.23%   +1.16%     
+ Complexity     2542     2539       -3     
============================================
  Files           386      366      -20     
  Lines         21879    19521    -2358     
  Branches       1812     1812              
============================================
- Hits          11830    10782    -1048     
+ Misses         9353     8110    -1243     
+ Partials        696      629      -67     

Files Changed	Coverage Δ
...ez/runtime/library/common/sort/impl/RssSorter.java	61.62% <ø> (ø)
.../runtime/library/common/sort/impl/RssUnSorter.java	61.62% <ø> (ø)
...library/common/sort/buffer/WriteBufferManager.java	88.99% <100.00%> (-0.37%)	⬇️

... and 22 files with indirect coverage changes

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