api!: remove all oauth support and drop DC_LP_AUTH flags

BREAKING CHANGE: removed oauth2 module, dc_get_oauth2_url FFI function, DC_LP_AUTH flags and configured/serverflags, and the oauth2 parameter/field from SMTP/IMAP clients, JSON-RPC interfaces, and CLI tools.

also contains regenerated provider data after dropping oauth in the update script.

src/qr/dclogin_scheme.rs

@@ -196,7 +196,6 @@ pub(crate) fn login_param_from_login_qr(
                     password: smtp_password.unwrap_or_default(),
                 },
                 certificate_checks: certificate_checks.unwrap_or_default(),
-                oauth2: false,
             };
             Ok(param)
         }