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feat: switch to SQL revocation database for revocation server, and to simple in-memory database for requestors

Requestors only need to be aware of the last x revocation records and none of the other record types.

Addionally:
- pass revocation configuration into RevocationStorage
- refactor irma.NewConfiguration functions to use options struct
- split RevocationStorage helper functions into separate structs
- add credentialtype to revocation record wrapper in irmago

feat: support revocation sessions in IRMA server, and move revocation code from irmaconfig.go to its own file

Null attributes are attributes with bigint value 0, meaning that the issuer skipped that attribute. Instead of aborting the session, the irmaclient now allows disclosures of null attributes, when the verifier requests it. This allows the irmaclient to prove that a particular attribute was not issued to it, and allows verifiers to request optional attributes alongside other attributes.

Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>