fix key import. #144
Description
Part of #56. issues that were already broken between ipfs-http-client and kubo
- see HTTPError: file argument 'key' is required when using go-ipfs node with ipfs-http-client js-ipfs#3547
- Kubo supports different format than JS-IPFS – see feat(cmds): add cleartext PEM/PKCS8 for key import/export kubo#8616
- see bug: key with invalid format during import over RPC provides unhelpful error message kubo#9508
- PEM export not yet supported in Libp2p: Support cleartext PEM key import/export libp2p/js-libp2p-crypto#244