R1:543f6355572a

Continue construction of `bin/celerity map`

Summary: Ref T4222. Continues porting `scripts/celerity_mapper.php` functionality into `bin/celerity map`. This is pretty much a `1:1` port with no functional changes, but hopefully the code is a little better factored. Particularly, more responsibilities are pluggalbe through `CelerityResources` now.

Test Plan: Ran `bin/celerity map` and inexpected the `var_dump()` output, which appeared to make sense.

Reviewers: btrahan, hach-que

Reviewed By: hach-que

CC…