feat: add local caching for remote IdP logos#942

Menrath wants to merge 2 commits intocatalyst:MOODLE_500_STABLEcatalyst/moodle-auth_saml2:MOODLE_500_STABLEfrom

Menrath:cache_idp_logosMenrath/moodle-auth_saml2:cache_idp_logosCopy head branch name to clipboard