Add record support

[chrisdone]

This adds support for records, like this:

hell/examples/22-records.hell

Lines 1 to 9 in 944231c

	data Person = Person { age :: Int, name :: Text }
	main = do
	Text.putStrLn $ Record.get @"name" Main.person
	Text.putStrLn $ Record.get @"name" $ Record.set @"name" "Mary" Main.person
	Text.putStrLn $ Record.get @"name" $ Record.modify @"name" Text.reverse Main.person
	person =
	Main.Person { name = "Chris", age = 23 }

The accessors, setters and modifiers aren't exactly Haskell-98 (perhaps more GHC2024), but otherwise declaration and construction are the same.