Flasksimpleauth

- add `FSA_JSON_ALLSTR` to cast values with `str` when in doubt.

- require _Flask 3_ (September 2023) to use JSON provider infrastructure and _CacheToolsUtils 10.0_.
- add `FSA_JSON_CONVERTER` directive to manage per-type JSON serialization
- add `add_json_converter` per-type hook registration.

- unsuccessful attempt at adding _Python 3.14_ to CI.
- improve dev automations, including parallelizing tests.
- improve tutorial.
- add experimental `FSA_CACHED_OPTS` directive.

- add JsonData section to tutorial.
- password manager refactoring
- add **experimental** support for _LDAP_ authentication.

- updated tutorial.
- improve recipes.
- improve documentation.
- improve optional parameter support.

- makes `FSA_AUTH` mandatory to declare the list of allowed schemes.
- requires _none_ authentication on `OPEN` routes, otherwise they are
turned into `AUTH`. (Should it rather be an error?).
- `AUTH` routes without effective authentication are turned into `CLOSE`.
- improve type name display on some errors.
- update tutorial.