feat: support conditional start of IPv6 dns servers

This PR does those things:
- [x] Refactored `DNSResolveCacheController`. Most of the logic moved to `dns` package types. Simplify and streamline logic.
- [x] Replace most of the goroutine orchestration with suture package.
- [x] Support per-item reaction to the dns listeners/servers failing to start. This allows us to ignore IPv6 errors if it's disabled.
- [x] Support per-item reaction to the dns listeners/servers failing to stop.
- [ ] Raise IPv6 listener on link-local address for dns (both TCP and UDP).
- [ ] Update kubelet's `resolv.conf` IPv4/IPv6 endpoints.

Closes siderolabs#9384

Signed-off-by: Dmitriy Matrenichev <[email protected]>

go.mod

@@ -169,6 +169,7 @@ require (
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.9.0
+	github.com/thejerf/suture/v4 v4.0.5
 	github.com/u-root/u-root v0.14.0
 	github.com/ulikunitz/xz v0.5.12
 	github.com/vmware/vmw-guestinfo v0.0.0-20220317130741-510905f0efa3

go.sum

@@ -724,6 +724,8 @@ github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsT
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 h1:kdXcSzyDtseVEc4yCz2qF8ZrQvIDBJLl4S1c3GCXmoI=
 github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
+github.com/thejerf/suture/v4 v4.0.5 h1:F1E/4FZwXWqvlWDKEUo6/ndLtxGAUzMmNqkrMknZbAA=
+github.com/thejerf/suture/v4 v4.0.5/go.mod h1:gu9Y4dXNUWFrByqRt30Rm9/UZ0wzRSt9AJS6xu/ZGxU=
 github.com/u-root/u-root v0.14.0 h1:Ka4T10EEML7dQ5XDvO9c3MBN8z4nuSnGjcd1jmU2ivg=
 github.com/u-root/u-root v0.14.0/go.mod h1:hAyZorapJe4qzbLWlAkmSVCJGbfoU9Pu4jpJ1WMluqE=
 github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 h1:pyC9PaHYZFgEKFdlp3G8RaCKgVpHZnecvArXvPXcFkM=