ARROW-6675: [JS] Add scanReverse function to dataFrame and filteredDataframe

[mmaclach]

• add scanReverse() to dataFrame and filteredDataframe
• add tests for scanReverse()

[wesm]

Can you open a JIRA issue? Thanks

[codecov-io]

Codecov Report

Merging #5480 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #5480       +/-   ##
===========================================
- Coverage   89.69%   89.58%    -0.11%     
===========================================
  Files         810      102      -708     
  Lines      114853     6628   -108225     
  Branches     1498     1501        +3     
===========================================
- Hits       103021     5938    -97083     
+ Misses      11821      679    -11142     
  Partials       11       11

Impacted Files	Coverage Δ
js/src/table.ts	85.45% <ø> (ø)	⬆️
js/src/compute/dataframe.ts	93.27% <100%> (+1.12%)	⬆️
python/pyarrow/ipc.pxi
cpp/src/parquet/column_page.h
cpp/src/plasma/test/external_store_tests.cc
cpp/src/arrow/array/builder_decimal.cc
cpp/src/plasma/client.cc
cpp/src/arrow/compute/compute_test.cc
cpp/src/arrow/python/io.cc
python/pyarrow/hdfs.py
... and 700 more

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[mmaclach]

@wesm added jira issue https://issues.apache.org/jira/browse/ARROW-6675

[kszucs]

Thanks @mmaclach and @trxcllnt !