infra: setup automated binary size regression tests

[th0br0]

For PRs, we should have a bot that checks the binary size changes as well. I believe there are some public github projects that have suchs bots running automagically (rust?)

[rajivshah3]

Maybe you could add a pipeline that runs Bloaty?

[th0br0]

Ideally, this will work in hand with buildkite artifact uploads, bloaty, and a bot that parses the outputs and reports back if size increased by too much via some combination of SLOC added/removed