feat(JVM): Annotations to set the ScalarStyle on a single field.

[nielsbasjes]

A first draft of what I asked for in #594
The main problem I faced is that the fun encodeString(value: String) as defined by Kotlin does not pass the descriptor and index.

So this first attempt works (on my machine) but does make that this will not work in a multithreaded situation and multiple yamls are written at the same time by the same instance.

So either that problem can be fixed in a different way or it is essentially impossible to build.

[charleskorn]

Thanks for the PR, the general approach looks good to me.

Could you please also add a comment to the relevant properties on YamlConfiguration to explain that these annotations take precedence over any configuration there?

[nielsbasjes]

I have updated the documentation a bit more.
Now in addition to the YamlConfiguration being shown as this:

You now also get this:

[nielsbasjes]

I have handled your review comments and it now has 2 annotations YamlWriteSingleLineStringUsingScalarStyle and YamlWriteMultiLineStringUsingScalarStyle.

I have also added a few more tests: different combinations of these 2 and having a single or multiline value)

I did not (yet) add a similar annotation for the ambiguous case because I did not yet understand how that works and should work.

[nielsbasjes]

NOTE: There is no documentation in YamlConfiguration for yamlNamingStrategy.
If you have a line I can add it right away.

[nielsbasjes]

I've handled the feedback as best as I understand what you want to see.
Looking forward to any other changes you would like me to make.

[charleskorn]

Thanks for the PR!

[nielsbasjes]

Squashed all commits I made to make it a lot cleaner

[charleskorn]

This looks good to me. Could you please fix the linting failures?

[charleskorn]

Thanks @nielsbasjes!

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