overhaul dioxus fullstack using a new implementation of server_fn
This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.
* Cache hashed assets forever in fullstack
* fix clippy
* fix fullstack test port
* fix fullstack clippy
* fix double insertion of meta in fullstack test
* pull out head element changes
* Fix cli-optimization test when interrupted
* remove tests for raw assets
* fix playwright tests
* look for hash in asset name instead of building a manifest
* undo changes to cli
* fix clippy
* fix test_file_name_looks_immutable
Jonathan Kelley