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Like the previous commit, this helps reduce allocations as well as
improve performance thanks to the well-optimized protowire package.

And, as before, we get to remove unnecessary code.

	name         old time/op    new time/op    delta
	Roundtrip-8    4.81µs ± 0%    4.35µs ± 1%  -9.59%  (p=0.004 n=5+6)

	name         old alloc/op   new alloc/op   delta
	Roundtrip-8    7.14kB ± 0%    6.86kB ± 0%  -3.83%  (p=0.000 n=6+5)

	name         old allocs/op  new allocs/op  delta
	Roundtrip-8       119 ± 0%       112 ± 0%  -5.88%  (p=0.002 n=6+6)

IPLD's codec helper reader has a relatively high cost, unfortunately. It
was the main contributor to a slowdown in go-merkledag when moving from
the old protobuf gogo-generated decoder to go-codec-dagpb.

Using a []byte also means we can reuse protobuf's well-optimized "wire
encoding" helpers, which gets us extra speed and allows removing some
code.

This should not matter in practice for the time being, as the only
go-codec-dagpb user is go-merkledag and it uses bytes.Buffer everywhere.

In the future it would be nice for go-codec-dagpb to be just as
efficient with a stream decoder, but right now I don't have the extra
week to get into that. Plus, if the core protobuf implementation works
on []byte, one can assume it's reasonable for us to do the same.

Using the new BenchmarkRoundtrip in go-merkledag with go-codec-dagpb, we
get a significant uplift in performance:

	name         old time/op    new time/op    delta
	Roundtrip-8    6.49µs ± 1%    5.34µs ± 1%  -17.74%  (p=0.002 n=6+6)

	name         old alloc/op   new alloc/op   delta
	Roundtrip-8    8.07kB ± 0%    7.50kB ± 0%   -7.04%  (p=0.002 n=6+6)

	name         old allocs/op  new allocs/op  delta
	Roundtrip-8       171 ± 0%       148 ± 0%  -13.45%  (p=0.002 n=6+6)

std's errors has had wrapping for years now.

update .github/workflows/automerge.yml: don't restrict the copy workflow to .github/workflows/ (#24)

update .github/workflows/autorebase.yml: don't restrict the copy workflow to .github/workflows/ (#22)

We're a semver v1, so we can't remove exposed APIs unless we bump to
v2+. Bumping the major version to just rename two APIs seems a bit
overkill; keeping the old ones around and deprecating them is much
easier.

This partially reverts commit b8473079.

At least go-merkledag and go-graphsync still need a prototype chooser,
and go-ipld-prime-proto provides one, so this simplifies integration
with downstreams.

It's worth noting that we just add PBNode here, while
go-ipld-prime-proto also added RawNode. This is because this dag-pb
module leaves raw nodes out, since those are now in
go-ipld-prime/codec/raw.

The logic is just three lines, but it's still easier to not have to
copy-paste these between different projects.

make compatible with ipld-prime linksystem changes

A similar change to Encode and Decode function names came in
go-ipld-prime v0.9.0, so this keeps this library in sync.

Improved package docs a bit to talk about the new go-ipld-prime
LinkSystem, which is a bit clearer to refer to than before.

Target-of-opportunity fix some typos in docs.

The module was defined as github.com/ipld/go-codec-dagpb/dagpb, but the
repository is at github.com/ipld/go-codec-dagpb. This means that neither
can be resolved as a valid Go package import path; the former results in
a GitHub 404, and the latter results in a valid GitHub repository which
holds a different module.

Rod confirmed that the /dagpb suffix wasn't intentional, so just get rid
of it.

While at it, mod tidy.

Fixes: https://github.com/ipld/go-codec-dagpb/pull/3