* feat(fullstack): add `render_handler_with_state`
When using server functions, the current pattern to access state such as
database connections is to use `register_server_fns_with_handler` on an
Axum router and 'inject' the state into the context provided to the
server function. However, this only affects function calls which go via
the Axum router; SSR renders bypass this, and therefore don't have
access to any state.
This commit adds an alternative `render_handler` which accepts some
additional state. That state is injected into the context in a
similar manner to `register_server_fns_with_handler`. SSR renders can
then proceed to run in the same way as HTTP calls.
* Change state object to 'inject_state' callback
Also add a compiling doctest example.
* remove the explicit for<'a> lifetime
* remove unused assets_path from render_handler_with_context example
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Co-authored-by: Evan Almloff <evanalmloff@gmail.com>
