the WriteApi does not check whether a tag value cotains unauthorized characters ("\n","\r"...)

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InfluxDB has some restrictions on tag values : they cannot contain some characters such as: line feed (\n), carriage return (\r). Currently, the Java client library does not check whether values of tags are safe (free of unauthorized characters) before writing them into InfluxDB.
For example, I have a measurement classe called `Temperature`, and it contains a tag field `location`. When I put `location="mad\nrid"` and I write it using `WriteApi`, it will throw the following exception: `partial write: unable to parse 'temperature,location=mad': missing fields dropped=0`. So a partial write will be done in the influxDB database: a new measurement `rid` will be mistakenly created, and it will contain only a part of the write.
If a tag value contains '\r', the java client will not even throw an exception, and it will perform an incorrect write into the database.

I think it would be really useful to add a method that ensures that tag values are correct before sending them to InfluxDB through the line protocol, in order to avoid incorrect writes and anomalous behaviors.

Beginne damit, den WriteApi-Pfad nachzuverfolgen, der Tag-Werte in das InfluxDB line protocol serialisiert. Überprüfe, wie Werte mit Zeilenvorschub und Wagenrücklauf behandelt werden, und füge anschließend eine Validierung hinzu, damit unsichere Werte keine unvollständigen oder fehlerhaften Writes erzeugen können; verwende, falls vorhanden, die bestehenden WriteApi-Tests, um beide Zeichen abzudecken.

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