Add coordinator client library, installation scripts, and new test runners

- Add coordinator client library to workspace
- Add installation documentation and heroscript
- Add new test runners for Osiris and Sal
- Update hero runner test to handle invalid heroscript errors
- Update README with installation instructions

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "bin/runners/sal",
     "bin/runners/hero",
     "bin/supervisor",
+    "lib/clients/coordinator",
     "lib/clients/job",
     "lib/clients/osiris",
     "lib/clients/supervisor",