feat(webapp): implement MVP for self-contained session URLs

[Alex Yusiuk (RRRadicalEdward)]

This PR adds support for config, autoconnect, and protocol query parameters in the Devolutions Gateway Standalone.
Since it is an MVP, there are many things left to be done (I marked them with TODO).
Here is a demo:
https://github.com/user-attachments/assets/249ccde3-1973-424b-bd19-78b9d3a71045

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[Benoît Cortier (CBenoit)]

LGTM!

I left a few comments about the vision for this feature on Slack, but I agree with all the TODOs you left 👍