refactor(api): handle option dicts properly

Do not copy a lot of lua strings (dict keys) to just strequal() them
Just compare them directly to a dedicated hash function.

feat(generators): HASHY McHASHFACE

src/nvim/msgpack_rpc/helpers.c

@@ -15,6 +15,7 @@
 #include "nvim/vim.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "keysets.generated.h"
 # include "msgpack_rpc/helpers.c.generated.h"
 #endif