Add support for OpenPGP keys attached to email resources

actions_resource.go

backend/ldap/resources.go

backend/ldap/util.go

go.mod

go.sum

integrationtest/openpgp_test.go

server/server.go

types.go

vendor/github.com/ProtonMail/go-crypto/AUTHORS

vendor/github.com/ProtonMail/go-crypto/CONTRIBUTORS

vendor/github.com/ProtonMail/go-crypto/LICENSE

vendor/github.com/ProtonMail/go-crypto/PATENTS

vendor/github.com/ProtonMail/go-crypto/bitcurves/bitcurve.go

...or/github.com/ProtonMail/go-crypto/brainpool/brainpool.go

vendor/github.com/ProtonMail/go-crypto/brainpool/rcurve.go

vendor/github.com/ProtonMail/go-crypto/eax/eax.go

...r/github.com/ProtonMail/go-crypto/eax/eax_test_vectors.go

vendor/github.com/ProtonMail/go-crypto/eax/random_vectors.go

...ub.com/ProtonMail/go-crypto/internal/byteutil/byteutil.go

vendor/github.com/ProtonMail/go-crypto/ocb/ocb.go