frontend: map: Add Custom Resources support

[faebr]

This PR adds Custom Resources to the Map in the frontend.

Filter dropdown

Custom Resources are grouped by API group in the dropdown and can be individually selected:

Edges

Edges between Custom Resources are shown for the Owner Reference in reverse order:

Details View

The same details view as in the Custom Resources Section is also shown in the Map:

Approach for adding Custom Resources

For now we have not squashed all the commits to show multiple ideas of how to add the CR details view. It was not clear for us which approach would be the best for this project, the latest one being the best integrated one from our point of view. Some changes were necessary since we dynamically load the CRD list, compared to the static approach of the base objects. If you think another approach would be better please let us know.

• 4570773ea82fc353992c29eb243c1a13692baee4 shows the first implementation which manually adds the details section.
• b7255fbaa10057d08f6db53f15197adc7f22950c uses the customResourceDefinition parameter in the KubeObjectDetails view.
• a34d579ed6d31d0a4d81b3e8e9fad7223d29d869 simplifies the CustomResourceDefinition Class by using duck-typing for detecting the object type instead of using a marker.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: faebr / name: Fabian (0013d7843587359398e39aa28262aef5fe4c4d9b, 446942426a74e1014edee3163d5463b170a528d3, c68365485d85aed79085d3846bb37703de2910e8, 6256dde436624ae841bece09e506ded13dc0d296, 49e4efed8217284c0a90306091c352091498a31f)
• :white_check_mark: login: VictorMarcolino / name: Victor Marcolino (ecdd0af58496bfceabb630f610a17ef0f8f4d9e9)
• :white_check_mark: login: alexandernorth / name: Alexander North (2b63daf0e0418adbb63ea1aa9690998f054e7820)

[sniok]

Do you want to take a look @joaquimrocha ? I think it's good to merge as-is

[joaquimrocha]

THank you @faebr and @sniok !

/lgtm /approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: faebr, joaquimrocha, sniok

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