Add a pretty json encoding for better testing / configuring experience

[lsampras]

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Use Cases

A better UX when users are trying to build/configure their pipeline, the primary usage would be with the console sink.

Pretty-json is much more friendlier to infer the structure of your data.

Attempted Solutions

I've attempted this on my fork and seems to work pretty well, although I might be missing edge cases or making invalid assumptions...

Proposal

Adding a simple encoding would work here based on underlying serde_json::to_writer_pretty implementation.

References

No response

Version

0.37.1

[jszwedko]

Thanks @lsampras ! I took a quick look at your branch and I think this is something we'd accept as a contribution if you feel inclined to open a pull request.

[lsampras]

@jszwedko I've opened #20384 for adding this, Can you take a look at that once?