[t] Add Alert API

.gitlab-ci.yml

dfssc/api/client.pb.go

dfssc/api/client.proto

dfssc/sign/promises.go

dfsst/api/resolution.pb.go

dfsst/api/resolution.proto

dfsst/archivesManager/archivesManager.go

dfsst/archivesManager/archivesManager_test.go

dfsst/checker/promise.go

dfsst/checker/promise_test.go

dfsst/checker/request.go

dfsst/checker/request_test.go

dfsst/entities/signatureArchives.go

dfsst/entities/signatureArchives_test.go

dfsst/resolve/resolve.go

dfsst/resolve/resolve_test.go

dfsst/server/server.go

dfsst/server/server_test.go

dfsst/testdata/cert.pem

dfsst/testdata/dfssp_rootCA.pem