Ignore compile_commands.json (#4680)

This is just a quality of life so that developers can symlink
compile_commands.json to wherever they place their build directory. The
reaoning for this is that a number of editor extensions use this file to
configure their LSP interface for improved editor support.

---
TYPE: NO_HISTORY
DESC: Ignore compile_commands.json

Author: davisp

.gitignore

@@ -26,6 +26,7 @@ examples/obj/*
 scripts/deps-staging/*
 .idea
 *.DS_Store
+compile_commands.json
 doc/venv
 doc/source/__pycache__
 doc/source/_build