25da15f9b1
This commit aggregates the following changes: 1. Fix the format (i.e., indentation) when printing stop hooks via `target stop-hook list`. 2. Add `IndentScope Stream::MakeIndentScope()` to make managing (and restoring!) of the indentation level on `Stream` instances more ergonomic and less error prone. 3. Simplify printing of stop hooks using the new `IndentScope`.