Newlines in tag values are not escaped

Summary

Newlines in tag values are not escaped.
I'm not exactly sure if they can be escaped (?), but currently bad values are being inserted instead.

Steps to reproduce

Try to insert a point where a tag value contains a newline, e.g:

Point.measurement("measurement")
    .tag("name", "foo\nbar") // Newline here
    .addField("count", 1)
    .time(0, SECONDS);

Actual behaviour

A new measurement bar is created due to the following being sent

measurement,name=foo
bar count=1 0

Expected behaviour

I guess the line protocol sent should look something like this?

measurement,name=foo\
bar count=1 0

If it's not possible to escape newlines, there should be an error instead.

Start by locating the Java client’s line-protocol serialization for tag values and reproduce the provided measurement with a newline in the tag. Confirm whether the protocol supports escaping; done means the value is escaped without creating a second measurement, or the client rejects it with an error, with a regression test covering the behavior.