New methods in KiwiIO to create a ByteArrayInputStream from a String

[sleberknight]

Create methods in KiwiIO to create a ByteArrayInputStream from a String. The places we use this (currently internal to several services) always use UTF-8 but we can have two methods, one that defaults to UTF-8 and an overload that accepts a Charset, e.g.

// proposed method signatures

// convert using UTF-8
ByteArrayInputStream newByteArrayInputStream(String value);

// convert using given Charset
ByteArrayInputStream newByteArrayInputStream(String value, Charset charset);

The "UTF8" method can simply delegate to the other method, passing UTF-8 for the Charset argument.

Also, the existing newByteArrayInputStreamOfLines method could be refactored to call the UTF-8 variant.