Close #6837: LaTeX: Support a nested table

[tk0miya]

Feature or Bugfix

• Feature

Purpose

• refs: LaTeX: Support a nested table #6837

Remaining tasks

• testing

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (2.0@26cd301). Click here to learn what that means.
The diff coverage is 58.33%.

@@          Coverage Diff           @@
##             2.0    #6838   +/-   ##
======================================
  Coverage       ?   83.78%           
======================================
  Files          ?      269           
  Lines          ?    41216           
  Branches       ?     6015           
======================================
  Hits           ?    34533           
  Misses         ?     5355           
  Partials       ?     1328

Impacted Files	Coverage Δ
sphinx/writers/latex.py	81.78% <58.33%> (ø)

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