Widget: Better handling of annotations in connection with defaultProps

[Rathoz]

Is your feature request related to a problem? Please describe.
Figure out a way to better handle cases like

Lua-Modules/lua/wikis/commons/Widget/Standings/PlacementChange.lua

Lines 52 to 55 in 60e88d5

	---@param props {change: integer?, emphasisThreshold: integer?}
	---@return Renderable?
	local function PlacementChangeWidget(props)
	---@cast props {change: integer, emphasisThreshold: integer}

, where default props make it optional for a caller, but promises that it exists within the function.

Additional context
Maybe using Partial Classes is the only possible way?