Astro 4.10

Astro's 4.10 release brings experimental type-safe environment variables, and enhancements to the Container API and Rewrites. The new built-in module, astro:env, aims to simplify use of environment variables, offering more control and structure over their management. The release also introduces the Container API, which allows for rendering Astro components outside the context of the Astro framework, thereby potentially enabling Astro's use in other environments. Following this, there have been changes to renderers that allow Vite-less environments to load and pass the renderer modules manually. The update also combines the existing headers and body into a new request. There are more bug fixes and improvements included as a part of the release.