Add and plumb through the ssh type.

cmd/cli/app/pflags.go

cmd/cli/app/search.go

openapi.yaml

pkg/generated/models/rekord_v001_schema.go

pkg/generated/models/search_index.go

pkg/generated/restapi/embedded_spec.go

pkg/pki/pki.go

pkg/pki/pki_test.go

pkg/pki/ssh/ssh.go

pkg/pki/ssh/testdata/hello_world.txt

pkg/pki/ssh/testdata/hello_world.txt.sig

pkg/pki/ssh/testdata/id_rsa

pkg/pki/ssh/testdata/id_rsa.pub

pkg/types/rekord/v0.0.1/rekord_v0_0_1_schema.json

tests/e2e_test.go

tests/ssh.go