Reduce the size by stripping debug symbols

[danlishka]

Update the ldflags option in the GoReleaser configuration to strip
the symbol table and DWARF information:

ldflags = -s -w

[danlishka]

Some examples of the size changes:

- artifact-cas: 43971790 -> 31674368
- control-plane: 74688180 -> 53272576
- cli_linux_amd64_v1: 83740805 -> 59338752
- cli_darwin_amd64_v1: 83179680 -> 66472096
- cli_darwin_arm64: 82637730 -> 66488994

[danlishka]

We may look into extracting debug symbols in the future:

• Please don't strip binaries, or publish debug symbols for stripped binaries kubernetes-sigs/external-dns#2646
• Distribute debugging symbols for every binary in a Kubernetes release kubernetes/kubernetes#73986