Adding missing common types in TypeSpec

[allenjzhang]

• [ ] managedidentitywithdelegation.json
• [ ] mobo.json
• [ ] networksecurityperimeter.json

[allenjzhang]

Should be done asap in the upcoming sprint.

[timotheeguerin]

We have issues for the first two already, do you want to combine into this one?

Mobo issue https://github.com/Azure/typespec-azure/issues/249 managedidentitywithdelegation issue https://github.com/Azure/typespec-azure/issues/944

[markcowl]

est: 3