Add a lib.vim file with some basic functionality.
Add a lib.vim file with some basic functionality.

This is a relatively small commit to get the conversation/work going.
I'm especially curious about your thoughts about testing. I think it
might make sense to require a real bazel instal to do real-integration
tests. Faking out the world will get a lot less realistic test coverage.

From/insipired by piperlib and blazelib.

bazelbuild/vim-bazel,bazelbuild/vim-bazel,bazelbuild/vim-bazel