Add magic function for :FindFirstAncestor()

[znotfireman]

Given that theres magic functions for :WaitForChild() and :FindFirstChild(), there should be a magic function for :FindFirstAncestor(), e.g:

-- Plugin
-- |_ MyPlugin
--    |_ Runtime
--       |_ Components
--          |_ Button
--          |_ Text

-- Plugin/MyPlugin/Runtime/Components/Button.luau
local Runtime = script:FindFirstAncestor("Runtime")
local Text = require(Root.Components.Text)

local function Button(scope, props)
 return -- ...
end

return Text