feat(column): per row click handlers for 'statuscolumn' (#40265)

Problem:
- Current 'statuscolumn' click label caveat is restrictive.
- v:virtnum is not unique to a line if it has both above and
  below virtual lines.
- 'statuscolumn' click handler may expect v:virt/lnum to be set.

Solution:
- Store per-row click definitions for the statuscolumn in a
  (nested line/virt number) map.
- Implement strategy that gives each 'statuscolumn' row a unique
  v:virtnum.
- Set v:virt/lnum when determining which line is clicked.

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