feat: added support for json dashboards

[Kerwood]

Signed-off-by: Patrick Kerwood patrick@kerwood.dk

Description of your changes

Added support for JSON dashboards.

I have:

• [x] Read and followed Crossplane's [contribution process].
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

With love :heart: .. And a local k8s cluster creating a dashboard in DD.

[ytsarev]

@Kerwood thanks a lot for your contibutions! Could you please resolve the conflicts and we can merge it in