fix: add `object` type to `CellValue` type definition(#1014, #1031) (#1054)
fix: add `object` type to `CellValue` type definition(#1014, #1031) (#1054)

* fix: add object type to CellValue type definition

* chore: apply code review
nhnent/tui.grid,nhnent/tui.grid,nhnent/fe.application-grid,nhnent/fe.application-grid,nhnent/tui.grid