feat: Add new TableCellSortButton

[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 focused on atoms involved in the table's body and was completed over a number of PRs: feat: Add new TableRowPrimaryAction #715, feat: Add new TableCellPrimaryData #716, feat: Add new TableCellDoubleLineLayout #717, feat: Add new TableBodyCell #718, feat: Add new TableBodyRow #719 and feat: Add new TableBody #720.
• The next chunk of work will be focused on the atoms involved in the table's head:
  • Part 1: Sort button (this PR)
  • Part 2: Header cell
  • Part 3: Header row
  • Part 4: Table head

This PR

• Adds TableCellSortButton.

[rpt-uk-github]

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Coverage variation	Diff coverage
Report missing for a2cc30e1	✅ 100.00%

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	Coverable lines	Covered lines	Coverage
Common ancestor commit (a2cc30e)	Report Missing	Report Missing	Report Missing
Head commit (bc42b19)	8508	7869	92.49%

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#725)	33	33	100.00%

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[kurtdoherty]

note: some or all of this may move to a component-agnostic place in future (e.g., perhaps utils). In particular, when we have our search params schema implemented, we'll likely want a sort param schema to help us serialise and parse sort fields and directions to and from the URL.