g.region: add JSON support

[kritibirda26]

Using parson, add JSON support to g.region module.

The output looks like as follows:

{
    "projection": 99,
    "zone": 0,
    "region": {
        "north": 228500,
        "south": 215000,
        "west": 630000,
        "east": 645000,
        "ns-res": 10,
        "ns-res3": 10,
        "ew-res": 10,
        "ew-res3": 10
    },
    "top": 1,
    "bottom": 0,
    "tbres": 1,
    "rows": 1350,
    "rows3": 1350,
    "cols": 1500,
    "cols3": 1500,
    "depths": 1,
    "cells": 2025000,
    "cells3": 2025000
}

The interaction of format option with existing flags needs more looking into. We may want to disallow some combinations.

I will add tests and update documentation once the JSON format is finalized.

[cwhite911]

@kritibirda26 please address the comments I left in the review and add tests to make sure the JSON format respects the various flag combinations.

[kritibirda26]

@cwhite911 I have updated the PR.

[kritibirda26]

@cwhite911 the pr is ready for review.

[cwhite911]

Looks good!

[echoix]

Checked and proxying @cwhite911's approval

[echoix]

@kritibirda26 is it possible to do a quick PR tomorrow to fix up a newly enforced ruff rule that was merged before your PR but after the last update from main of that branch?
There is one error in main, and all the following PRs to main https://github.com/OSGeo/grass/actions/runs/10341561803/job/28623503657#step:8:19

There shouldn’t be any fixes available though (for now). ruff check . --preview with pip install ruff===0.5.6

[kritibirda26]

@echoix Can I disable the inspection for that block using a comment because the alternative rewrite using items would be unnecessarily convoluted?

[echoix]

@echoix Can I disable the inspection for that block using a comment because the alternative rewrite using items would be unnecessarily convoluted?

Doesn't this work:

        for key, value in expected.items():
            if isinstance(value, float):
                self.assertAlmostEqual(value, output_json[key], places=6)
            else:
                self.assertEqual(value, output_json[key])

[kritibirda26]

I'll try that, I thought the error was because of the output_json[key] and not expected[key].