types/iox: add function types for Reader and Writer (#14366)

Throughout our codebase we have types that only exist only
to implement an io.Reader or io.Writer, when it would have been
simpler, cleaner, and more readable to use an inlined function literal
that closes over the relevant types.

This is arguably more readable since it keeps the semantic logic
in place rather than have it be isolated elsewhere.

Note that a function literal that closes over some variables
is semantic equivalent to declaring a struct with fields and
having the Read or Write method mutate those fields.

Updates #cleanup

Signed-off-by: Joe Tsai <joetsai@digital-static.net>

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