refactor: Add IChatClient with transient lifetime for all providers #116
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IChatClients are usually registered as singletons, but transient lifetimes are necessary for us because the user can change base address or api key at runtime and these settings can only be passed via constructors.
The performance overhead of creating new instances is negligible, however, because execution time is completely dominated by model response time.
The PR adds a bit of redundant service configuration code but makes provider configuration via UI more robust (by always reading base address, api key, and model name from provider configuration), easier to reason about, and easier to maintain.