Made Exercise with Multi-Stream Marten projection to be async

Added link to RaiseSideffects docs

Fixed build in exercises

Adjusted multistream exercises to make them more real-world

Added Multi stream projection exercise to introduction to Event Sourcing workshop

Fixed Wolverine Helpdesk sample

Fixed ECommerce Marten sample

Bumped aspire dependencies

Fixed tests related to Marten v8 migration

Fixed also esdb weird AsyncEnumerable conflict issue

Upgraded Marten code to the latest version

Fixed breaking changes in Marten v8 bump

FixedBumped Microsoft extnesions packages and removed obsolete Marten.CommandLine tool

Bumped Marten, Wolverine and Npgsql versions

Fixed versions conflicts and package vulnerabilities causing build errors