Add changelog and bump version for proposed 4.3.0 release

[alamb]

re #292

Note: merging into active_release (not master)

I would like to propose a 4.3.0 Arrow release. Here is the changelog:

• a7656a8 refactor lexico sort (add lexicographically partition points and ranges #424) (Cherry pick add lexicographically partition points and ranges to active_release #441)
• 714f124 refactor lexico sort (refactor lexico sort for future code reuse #423) (Cherry pick refactor lexico sort for future code reuse to active_release #442)
• 033dd4f Derive Eq and PartialEq for SortOptions (Derive Eq and PartialEq for SortOptions #425) (Cherry pick Derive Eq and PartialEq for SortOptions to active_release #433)
• f5aa702 Sort by float lists (Sort by float lists #420) (Cherry pick Sort by float lists to active_release #435)
• e64c9eb Fix bug with null buffer offset in boolean not kernel (Fix bug with null buffer offset in boolean not kernel #418) (Cherry pick Fix bug with null buffer offset in boolean not kernel to active_release #434)
• 5b80035 Cherry pick Reduce memory usage of concat (large)utf8 to active_release (Cherry pick Reduce memory usage of concat (large)utf8 to active_release #411)
• 8179193 Fix out of bounds read in bit chunk iterator (Fix out of bounds read in bit chunk iterator #416) (Cherry pick Fix out of bounds read in bit chunk iterator to active_release #432)
• 1327abe Add set_bit to BooleanBufferBuilder to allow mutating bit in index (Add set_bit to BooleanBufferBuilder to allow mutating bit in index #383) (Cherry pick Add set_bit to BooleanBufferBuilder to allow mutating bit in index to active_release #431)
• 59bd90a Respect max rowgroup size in Arrow writer (Respect max rowgroup size in Arrow writer #381) (Cherry pick Respect max rowgroup size in Arrow writer to active_release #430)
• 7f7d714 add more tests for window::shift and handle boundary cases (add more tests for window::shift and handle boundary cases #386) (Cherry pick add more tests for window::shift and handle boundary cases to active_release #429)
• e3d6792 Simplify window using null array (Simplify shift kernel using new_null_array #370) (Cherry pick Simplify shift kernel using new_null_array to active_release #402)
• a906dbe Doctests for FixedSizeBinaryArray (Doctests for FixedSizeBinaryArray #378) (Cherry pick Doctests for FixedSizeBinaryArray to active_release #403)
• 4d216f3 ensure null-counts are written for all-null columns (ensure null-counts are written for all-null columns #307) (Cherry pick ensure null-counts are written for all-null columns to active_release #404)
• c928d57 allow to read non-standard CSV (allow to read non-standard CSV #326) (Cherry pick allow to read non-standard CSV to active_release #407)
• db581f3 parquet: Speed up BitReader/DeltaBitPackDecoder (parquet: Speed up BitReader/DeltaBitPackDecoder #325) (Cherry pick parquet: Speed up BitReader/DeltaBitPackDecoder to active_release #408)
• 8059cf5 Add (simd) modulus op (Add (simd) modulus op #317) (Cherry pick Add (simd) modulus op to active_release #410)
• 07d00c0 Add doctest for ArrayBuilder (Add doctest for ArrayBuilder #367) (Cherry pick Add doctest for ArrayBuilder to active_release #412)
• 84fed05 allow SliceableCursor to be constructed from an Arc directly (allow SliceableCursor to be constructed from an Arc directly #369) (Cherry pick allow SliceableCursor to be constructed from an Arc directly to active_release #401)

Created with this command:

git rev-list 4.2.0..apache/active_release --pretty=oneline

As always, help to format this better would be most appreciated

[alamb]

I added this one back in for posterity

[codecov-commenter]

Codecov Report

Merging #444 (a7656a8) into active_release (a7656a8) will not change coverage.
The diff coverage is n/a.

❗ Current head a7656a8 differs from pull request most recent head b1998ab. Consider uploading reports for the commit b1998ab to get more accurate results

@@               Coverage Diff               @@
##           active_release     #444   +/-   ##
===============================================
  Coverage           82.69%   82.69%           
===============================================
  Files                 163      163           
  Lines               44775    44775           
===============================================
  Hits                37025    37025           
  Misses               7750     7750           

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