Added middleware that provides cache-control headers

[tmolteno]

I've added some middleware to do basic cache-control headers. Seems to work pretty well in testing.

The default is 300 seconds. I've added some exceptions

app.add_middleware(
    client_cache_middleware.AdvancedClientCacheMiddleware,
    default_max_age=300,
    path_configs={
        "/auth": {"no_cache": True},                          # No cache for auth endpoints
        "/imaging/antenna_positions": {"max_age": 600},         # No cache for auth endpoints
        "/imaging/vis": {"max_age": 15},        # 15 second cache for vis data
        "/vis/data": {"max_age": 60},        # 60 second cache for vis data
        "/raw/data": {"max_age": 60},        # 60 second cache for vis data
    }
)