Add a `std::io::read_to_string` function

The equivalent of `std::fs::read_to_string`, but generalized to all
`Read` impls.

As the documentation on `std::io::read_to_string` says, the advantage of
this function is that it means you don't have to create a variable first
and it provides more type safety since you can only get the buffer out
if there were no errors. If you use `Read::read_to_string`, you have to
remember to check whether the read succeeded because otherwise your
buffer will be empty.

It's friendlier to newcomers and better in most cases to use an explicit
return value instead of an out parameter.

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