OpenID Federation and Trust management pending tasks

[peppelinux]

• [x] #190
• [ ] ./federation/trust_chain_builder.py:46: # TODO - prefetch cache?`
• [x] #191
• [x] #182
• [x] #183
• [ ] ./federation/statements.py:250: # TODO : cache of issuers -> it would be better to have a proxy function`
• [ ] ./federation/statements.py:259: # TODO: snippet for CACHE`
• [x] #184
• [x] ./federation/statements.py:464: # TODO - this could be different from ZERO`
• [x] #180
• [x] #175
• [x] #176
• [x] #177
• [x] #178
• [x] ./satosa/backend.py:534: # TODO: X.509 as alternative to Federation`
• [x] ./satosa/backend.py:540: # TODO: generalyze also for x509`
• [x] ./storage/mongo_storage.py:254: "x509": {} # TODO x509`

[peppelinux]

Aggiunta metadata policy su validator e builder https://github.com/italia/eudi-wallet-it-python/blob/dev/pyeudiw/federation/trust_chain_validator.py#L222 https://github.com/italia/eudi-wallet-it-python/blob/dev/pyeudiw/federation/trust_chain_builder.py valutare delta tra https://github.com/rohe/fedservice/blob/master/src/fedservice/entity/function/policy.py e https://github.com/italia/spid-cie-oidc-django/blob/main/spid_cie_oidc/entity/policy.py migrare il codice riprotando autore e licenza e migrare le unità di test qui esempi https://github.com/italia/spid-cie-oidc-django/blob/main/spid_cie_oidc/entity/tests/test_05_policy.py https://github.com/rohe/fedservice/blob/master/tests/test_05_policy.py

[peppelinux]

See also this https://github.com/italia/eudi-wallet-it-python/issues/143

[peppelinux]

To be considered completed,

the cache will be considered in a future milestone