Expose 2 functions from std.json. These functions take a slice of bytes
and forward them to a given writer as a JSON encoded string.
The use case I have for this is in a custom JsonStringWriter. This writer
takes data and automatically encodes it as JSON string characters and
forwards it to an underlying writer. I use this JsonStringWriter in
combination with std.fmt.format to go directly from a format string/arg
pair to JSON. This way I don't have to format my string into a separate
buffer first and encode it afterwards, which avoids the need to create
a temporary buffer to hold the unencoded but formatted string.
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