feat: Add new TableBodyCell

[kurtdoherty]

Context

• We have table atoms in @reapit/elements/lab/table, but these don't facilitate the level of nuance required by the DS. For example:
  • They are pinned to semantic table elements like td, tr and so on, but we may need the flexibility of using them in a div-based DOM structure instead.
  • They do not provide any solution for the primary row action (which is meant to appear like the row itself is interactive).
  • They do not provide any solution for rendering row header cells.
  • They require column widths to be defined at the cell-level of the table rather than once at the table-level.
• We want to enhance the capability of our table atoms when implementing "official" core versions of them (i.e. the table atoms that will be available via @reapit/elements/core/table.
• The first chunk of this work will be done over a number of PRs and be focused on atoms involved in the table's body:
  • Part 1: feat: Add new TableRowPrimaryAction #715
  • Part 2: feat: Add new TableCellPrimaryData #716
  • Part 3: feat: Add new TableCellDoubleLineLayout #717
  • Part 4: Body cell (this PR)
  • Part 5: Body row
  • Part 6: Table body

This PR

• Adds TableBodyCell. This component handles the layout requirements of the actual cell within the table's body (classically, the <td> and <th> elements).

[rpt-uk-github]

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Coverage variation	Diff coverage
Report missing for 846e0cf1	✅ 100.00%

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	Coverable lines	Covered lines	Coverage
Common ancestor commit (846e0cf)	Report Missing	Report Missing	Report Missing
Head commit (15055f5)	8397	7761	92.43%

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#718)	16	16	100.00%

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