[API change] Unify grid table parsing (#7971)

Grid table parsing in Markdown and rst are updated use the same
functions. Functions are generalized to meet requirements for both
formats.

This change also lays the ground for further generalizations in table
parsers, including support for advanced table features.

API changes in Text.Pandoc.Parsing:

- Parse results of functions `tableWith'` and `gridTableWith'` are now a
  `mf TableComponents` instead of a quadruple of alignments, column
  widths, header rows and body rows.

Additional exports from Text.Pandoc.Parsing:

- `tableWith'`
- `TableComponents`
- `TableNormalization`
- `toTableComponents`
- `toTableComponents'`

0 files changed, 0 insertions, 0 deletions