OpenID Federation and Trust management pending tasks

[peppelinux]

• ./federation/trust_chain_validator.py:211: # TODO - apply metadata policy and get the final metadata #190
• ./federation/trust_chain_builder.py:46: # TODO - prefetch cache?`
• ./federation/trust_chain_builder.py:258: # TODO: create a proxy function that gets tm issuers ec from` #191
• ./federation/statements.py:90: # TODO: pydantic entity configuration validation here` #182
• ./federation/statements.py:189: # TODO: pydantic entity configuration validation here` #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`
• ./federation/statements.py:375: # TODO: pydantic entity configuration validation here` #184
• ./federation/statements.py:464: # TODO - this could be different from ZERO`
• ./trust/trust_anchors.py:18: # TODO: log warning` #180
• ./trust/__init__.py:23: # TODO: implement automatic detection of trust evaluation` #175
• ./trust/__init__.py:78: # TODO - at least a TA entity id is required for a discovery process` #176
• ./trust/__init__.py:94: # TODO - apply metadata policy and get the final metadata` #177
• ./trust/__init__.py:95: # for now the final_metadata is the EC metadata -> TODO final_metadata` #178
• ./satosa/backend.py:534: # TODO: X.509 as alternative to Federation`
• ./satosa/backend.py:540: # TODO: generalyze also for x509`
• ./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 #143

[peppelinux]

To be considered completed,

the cache will be considered in a future milestone