Escaping issue with tag values

This issue occurs in our case because a user has entered specific meta data fields as just \.
According to the Influx docs, \ does not need to be escaped, but may be.
In our case, however, the backslash is followed with a comma, because it is at the end of the tag value, followed by another tag value, leading to messed up interpretation of the whole record.

In my opinion, the safest way to handle this is to always escape backslashes.

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. Create as List<> with at least one tag containing just a backslash \
2. Write this list to InfluxDB using
   client.getWriteApiBlocking().writeMeasurements(WriteParameters.DEFAULT_WRITE_PRECISION, myList);

Expected behavior:
Data would be inserted correctly.

Actual behavior:
Influx returns:
HTTP status code: 400; Message: unable to parse 'metrics,account.companyName=\,account.contactCity=\ [...]

Specifications:

• Client Version: 6.7.0
• InfluxDB Version: 3.7
• JDK Version: 17
• Platform: Linux/Docker/openjdk:17-alpine

从 client.getWriteApiBlocking().writeMeasurements(...) 开始，使用仅包含一个反斜杠的 tag 值，后面再跟随另一个 tag，复现该失败。跟踪该 measurement 在发送请求之前是如何序列化的，然后验证生成的 record 能被 InfluxDB 接受，并为此情况添加覆盖测试。