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* event: Add autonat events (#25)

* add events for identify (#26)

* implement caching for rsaKey.Bytes()

* store marshalled protobuf in cache for RsaPublicKey.Bytes()

* fix(crypto): fix build when openssl is enabled

* add godocs to routability events.
Co-authored-by: Łukasz Magiera <magik6k@users.noreply.github.com>
Co-authored-by: Whyrusleeping <why@ipfs.io>
Co-authored-by: Adin Schmahmann <adin.schmahmann@gmail.com>
Co-authored-by: Steven Allen <steven@stebalien.com>

incorporates code review comments from @raulk; changes KeyPairFromKey to KeyPairFromStdKey and improves godoc.