feat: model experiments wait handler

[paul-sffrth]

Description

Wait handlers for model experiments

Checklist

• Issue was linked above
• No generated code was adjusted manually (check comments in file header)
• Changelogs
  • Changelog in the root directory was adjusted (see here)
  • Changelog(s) of the service(s) were adjusted (see e.g. here)
• VERSION file(s) of the service(s) were adjusted
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Unit tests got implemented or updated
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[GokceGK]

Thanks for your contribution.

Notice.txt is not part of this PR, but I just recognized a point in there.

Can you please change the first line to

STACKIT Model Experiments SDK for Go

[marceljk]

nitpick

Suggested change

	log.Printf("[Model Experiments] Triggered creation of Model Experiments Instance with ID: \"%s\".\n", createInstanceResp.Instance.Id)
	log.Printf("[Model Experiments] Triggered creation of Model Experiments Instance with ID: %q.\n", createInstanceResp.Instance.Id)

[marceljk]

Suggested change

	log.Printf("[Model Experiments] Model Experiments Instance \"%s\" has been successfully created.\n", createInstanceResp.Instance.Id)
	log.Printf("[Model Experiments] Model Experiments Instance %q has been successfully created.\n", createInstanceResp.Instance.Id)

[marceljk]

Suggested change

	log.Printf("[Model Experiments] Retrieved Model Experiments Instance with ID: \"%s\" and display name: \"%s\"\n", getInstanceResp.Instance.Id, getInstanceResp.Instance.Name)
	log.Printf("[Model Experiments] Retrieved Model Experiments Instance with ID: %q and display name: %q\n", getInstanceResp.Instance.Id, getInstanceResp.Instance.Name)

[marceljk]

Suggested change

	log.Printf("[Model Experiments] Updated Model Experiments Instance with ID: \"%s\" and display name: \"%s\"\n", partialUpdateInstanceResp.Instance.Id, partialUpdateInstanceResp.Instance.Name)
	log.Printf("[Model Experiments] Updated Model Experiments Instance with ID: %q and display name: %q\n", partialUpdateInstanceResp.Instance.Id, partialUpdateInstanceResp.Instance.Name)

[marceljk]

replace it also in all following prints

[marceljk]

Suggested change

	const (
	INSTANCESTATE_ACTIVE = "active"
	INSTANCESTATE_IMPAIRED = "impaired"
	TOKENSTATE_ACTIVE = "active"
	)

These aren't used at all and should be removed

[marceljk]

ErrorState is missing

Suggested change

	},
	DeleteHttpErrorStatusCodes: []int{http.StatusNotFound},
	},
	ErrorState: []modelexperiments.InstanceState{modelexperiments.INSTANCESTATE_IMPAIRED},
	DeleteHttpErrorStatusCodes: []int{http.StatusNotFound},