[C bindings] Have a single API function for opening all sorts of databases

[pdenapo]

It would be nice to have an API that can open any type of connection (like you would for instace do in javascript using libsql-js) with a given URL / database location.

Futhermore, the C API seems to be no where documented. After some testing, I have found the following

1. libsql_open_ext works with

":memory:"
"file:prueba.db"

2. but for a remote http connection like

"http://127.0.0.1:8080"
"libsql://yourdb-username.turso.io"

you need to use libsql_open_remote. But this function does not understand the

":memory:"
"file:prueba.db"

schemas.

[pdenapo]

You can see my test program at my libsql-C-testing repository

There I have created also a function int libsql_open_any that does exactly this. If you think that this is a good idea, I may submit a pull request. But may be this just must be the
default libsql_open_remote behavoir.

(But perhaps you already have an API for doing this, I don't know)