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* run go mod tidy

* omit receiver name if unused

* remove unused type testkey in tests

* fix duplicate import of go-multiaddr

* fix use of deprecated peer.IDB58{Encode,Decode}

* use bytes.Equal instead of bytes.Compare

* fix unnecessary assigments to blank identifier

* use time.Until instead of t.Sub(time.Now())

* fix use of deprecated go-multihash.ID

* add missing error check in envelope test

* fix error check in tests

This PR is a non-substantive change with the goal of making this method
`ExtractPublicKey` from a `peer.ID` clearer to the reader. This goal is
accomplished by using the full name of the identity hash code `IDENTITY` instead
of the deprecated `ID` code. This change makes its clearer to the reader that
there is a trivial way to compute the public key given the digest. Without this
change it is easy to confuse `ID` with a concept relating to peer IDs (and thus
implying this function somehow computes a hash pre-image to get the
corrresponding public key.