Hermetic builds

[rdong8]

A long-term goal would be to switch this project over to using a "hermetic" build system like Bazel or even better Buck2. I like Buck2 better but it's earlier in its infancy than Bazel and is not really in a usable state right now.

Blockers (Bazel):

• Stabilize C++20 module and C++23 std module support (see here).