feat: PhaseTwo API SDK generated via Kiota

[curiousvlxd]

Hi @NikiforovAll!

PhaseTwo is a set of extensions for Keycloak's Admin API, enabling advanced multi-tenancy, user, and organization management.
This PR introduces a Kiota-generated SDK for the PhaseTwo Admin API, based on the OpenAPI specification:
🔗 https://raw.githubusercontent.com/p2-inc/phasetwo-docs/main/openapi.yaml

---

To be done

• Tests
• Possible non-Kiota SDK implementation (separate project, tbd)

[curiousvlxd]

I've followed such repetitive namespace naming, please let me know if it's correct:
PhaseTwo.AuthServices.Sdk.Kiota.Admin.Admin.* similar to Keycloak.AuthServices.Sdk.Kiota.Admin.Admin.*

[Copilot]

Pull Request Overview

Introduces a Kiota-generated C# SDK for the PhaseTwo Keycloak Admin API, providing client, models, and DI extensions.

• Adds kiota-lock.json to lock generator settings.
• Provides ServiceCollectionExtensions and PhaseTwoAdminClientOptions for DI setup.
• Includes generated PhaseTwoAdminApiClient, Models, RequestBuilders, and a new project file.

Reviewed Changes

Copilot reviewed 91 out of 91 changed files in this pull request and generated no comments.

File	Description
src/PhaseTwo.AuthServices.Sdk.Kiota/kiota-lock.json	Stores Kiota generator configuration
src/PhaseTwo.AuthServices.Sdk.Kiota/ServiceCollectionExtensions.cs	Adds DI extension methods for the client
src/PhaseTwo.AuthServices.Sdk.Kiota/PhaseTwoAuthServices.Sdk.Kiota.csproj	Defines project metadata and package settings

Comments suppressed due to low confidence (1)

src/PhaseTwo.AuthServices.Sdk.Kiota/ServiceCollectionExtensions.cs:147

• [nitpick] The explicit assignment of options.SslRequired duplicates the input; consider removing it or documenting why it’s needed to reduce redundant code.

            // redundant

[NikiforovAll]

@curiousvlxd thank you for the contribution, and sorry for the late reply.

I think it is better to create keycloak-authorization-services-dotnet-contrib as a dedicated space for such extensions. It will be an opprotunity for others to be more creative. What do you think? If you agree, I will create the contrib repo and update the docs to point to it.

Are there any blockers that stop us from moving this one to the contrib repo?