Migration to bazelmod/Bazel 8

[stridge-tnp]

This is a draft of migration to bazel 8 and away from WORKSPACE. Its based on the branch @hovind made that i have modified slightly.

Relevant issues: #336 #210
Revelant PRs: bazelbuild/bazel-central-registry#4341

.bazelrc config

common --registry=https://raw.githubusercontent.com/UebelAndre/bazel-central-registry/verilator

MODULE.bazel snippet

bazel_dep(name = "rules_hdl", version = "")
git_override(
    module_name = "rules_hdl",
    commit = "34c35fe03f06d7f7ded79a36e54d73415fc12595",
    remote = "https://github.com/TernaryNP/bazel_rules_hdl.git",
)

bazel_dep(name = "verilator", version = "5.034")

I have verified that verilator is working correctly with these changes. Maybe someone can take over from here and ensure other parts of bazel_rules_hdl are not broken.
@hovind @UebelAndre @QuantamHD