[core] add a lasso_server_load_federation method

This method allows to load providers in bulk from what is called a
federation file, i.e a SAML metadata file containing declarations for
more than one provider. Those file are usually signed to bind some trust
to its content, so lasso_server_load_federation can take an optional
file path to a certificate chain file used to check the signature on the
given XML content. Only same document signature is accepted (i.e. there
must be only one XML signature reference and it should be to the empty
string meaning the « current » document).

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