add log_proof impl

Makefile

cmd/cli/app/log_info.go

cmd/cli/app/log_proof.go

cmd/cli/app/root.go

cmd/cli/app/upload.go

cmd/cli/app/verify.go

openapi.yaml

pkg/api/tlog.go

pkg/api/trillian_client.go

pkg/generated/client/tlog/get_log_proof_parameters.go

pkg/generated/client/tlog/get_log_proof_responses.go

pkg/generated/models/consistency_proof.go

pkg/generated/models/inclusion_proof.go

pkg/generated/models/log_entry.go

pkg/generated/models/log_info.go

pkg/generated/models/search_log_query.go

pkg/generated/restapi/embedded_spec.go

...i/operations/entries/get_log_entry_by_index_parameters.go

...rated/restapi/operations/tlog/get_log_proof_parameters.go

...erated/restapi/operations/tlog/get_log_proof_responses.go