* Lint on Go 1.19

Unless new syntax is backward-incompatible, we should lint on the most
recent Go supported Go version. This PR changes lint to run on Go 1.19
and mechanically reformats comments with `gofmt -s -w .`.

* Use new Godoc links

Where possible, use Go 1.19's new Godoc links to refer to types,
packages, and external websites.

* Update deps, including golangci-lint

Update to latest golangci-lint (and other deps). Update to fix lint from
checks that now support generics.

Restructure so that the compression pool constructor doesn't return
nils. Unless there's an accompanying non-nil error, this makes nil
pointer dereferences too likely.