Improve robustness in mixed network environments

Update multi-arch build

Decouple CI_TARGET_ARCHITECTURE and CI_GOARCH
Explicitly select go_binary build output

Add instructions for macOS and Windows

Add build instructions and target for macOS and Windows.

Add instructions for running the non-packaged installation and generating a default configuration.

Create the `certs` directory when running independently of the scion-daemon package.

Add IPv6 support

Support IPv6 Neighbor Discovery Protocol (NDP) Router Advertisements (RA) hinting
Support DHCPv6 Vendor-specific Information Option hinting

Update build config

Update go version
Update Bazel BUILD files
Update bazelbuild rules_go version
Update gazelle version

Update Bazel build config

Update BUILD.bazel files

Multiplatform improvement

Small fix

Improve the dhcpclient hook's POSIX compliance

Add back build prerequisite go_deps.bzl

Make go_deps.bzl a non-phony prerequisite for build
Only update go_deps.bzl if `go.mod`  was changed, only reset `go_deps.bzl` if it does not exists or is empty
Add realclean target that also deletes `go_deps.bzl` in addition to the rest of the bazel cleanup