[Java] VarCharWriter should support writing from `Text` and `String`

[lidavidm]

Describe the enhancement requested

VarCharWriter only exposes methods for writing from an ArrowBuf. As with #37705, this means that to write a string in this API, you have to copy your string to a byte[], then copy it to a new allocation, and then copy that again to the actual data buffer. The implementation already has methods for writing from a Text, so we should just expose that in the interface. It may also be useful to expose a method that takes a String, which would serialize it to a Text object inside the writer for you.

Component(s)

Java

[lidavidm]

Closed by @jduo in #37883