Storage should have the option of searching for instances based on Username

[khanrn]

Description

What needs to be solved?

[This is an extension of #3, so it is suggested to go through #3 before starting on this one]

At the time of creating this issue https://github.com/Altinn/altinn-register didn't support username lookup. So, after username look up being added to the altinn-register(Altinn/altinn-register#178) we need to add username lookup here:

altinn-storage/src/Storage/Controllers/InstancesController.cs

Line 93 in fd0d629

/// <param name="instanceOwnerIdentifier">Instance owner identifier, i.e. Person:PersonNumber, Organisation:OrganisationNumber.</param>

Related issue

• Storage should have the option of searching for instances based on person or org number, or other #3
• Lookup of party based on username altinn-register#178

How do you want it solved?

Need to add username look up functionality to the InstancesController controller's GetInstances method.

For reference

• Header name: X-Ai-InstanceOwnerIdentifier
• Value should be prefixed like this: Username:<Username>

Acceptance criteria

• The service can find instances based on a username.

[olebhansen]

Need to clarify who is going to use this/how, and how auth is going about this concept.
Also blocked by Altinn/altinn-register#178