IgniteUI / igniteui-grid-lite / 32834151089

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Overhaul grid a11y, navigation and rendering (#79)

Screen readers were silent over the grid body: ARIA state lived on
scattered attributes and DOM focus never reached the cells. Holding
an arrow key re-rendered every visible row per keystroke.

Accessibility
- Implement the full ARIA grid pattern through ElementInternals:
  roles, row/column counts and indices, aria-sort, aria-selected.
  The filter row is modeled as a second header row.
- Use roving focus. Navigation and click activation place real DOM
  focus on the active cell so assistive technology announces it;
  aria-activedescendant cannot cross shadow boundaries. The
  virtualizer reclaims focus when scrolling removes the focused
  cell.

Performance
- Keep the row renderer identity stable across activation. The
  virtualizer re-renders all rows when renderItem changes, so
  activation now updates only the two affected rows.
- Derive column track sizes only when the configuration changes and
  notify context consumers at mutation points, not on every host
  update.

API and structure
- navigateTo(row, options) replaces positional arguments. Activation
  without a column keeps the current one instead of clearing it.
- Rename internal tags to the igc-grid-lite-* prefix.
- Defer filter row and editor element definitions until a filterable
  column renders.
- Route all render-root queries through the DOM controller so other
  controllers no longer reach into the grid DOM directly.
- Skip filter expressions whose conditions no column resolved.

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