support configuring jackson JsonParser. Feature

[rmanibus]

Fix #2271

Please DO NOT FORCE PUSH. Don't worry about messy history, it's easier to do code review if we can tell what happened after the review, and force pushing breaks that.

Please make sure that your PR allows edits from maintainers. Sometimes it's faster for us to just fix something than it is to describe how to fix it.

After creating the PR, please add a commit that adds a bullet-point under the [Unreleased] section of CHANGES.md, plugin-gradle/CHANGES.md, and plugin-maven/CHANGES.md which includes:

• [ ] a summary of the change
• either
  • [ ] a link to the issue you are resolving (for small changes)
  • [ ] a link to the PR you just created (for big changes likely to have discussion)

If your change only affects a build plugin, and not the lib, then you only need to update the plugin-foo/CHANGES.md for that plugin.

If your change affects lib in an end-user-visible way (fixing a bug, updating a version) then you need to update CHANGES.md for both the lib and all build plugins. Users of a build plugin shouldn't have to refer to lib to see changes that affect them.

This makes it easier for the maintainers to quickly release your changes :)

[rmanibus]

sounds good ! on more thing, I am wondering if enabling this specific feature ALLOW_COMMENTS would not have for result to effectively swallow the comment. This will allow jackson to read the json with the comment, but the pretty print would likely not contains the comment anymore.

[nedtwigg]

I am wondering if enabling this specific feature ALLOW_COMMENTS would not have for result to effectively swallow the comment

Add a test to find out!

• https://github.com/diffplug/spotless/blob/main/testlib/src/test/java/com/diffplug/spotless/json/JacksonJsonStepTest.java

To merge this, I need

• a test showing that it does what you want
• update changelogs
• update docs

[rmanibus]

I took some time to test this and the comments indeed are getting swallowed. But at least formatting is not failing anymore which is already an improvement ...

I don't think we can have a better result with jackson since comments are simply not part of the java representation.

[nedtwigg]

Needs spotlessApply and changelog entries.