Display filename of active view/trace (if available)

- Search filename of active view (if available) and display it in the toolbar (page top-center)
- Rename TraceViewComponent's event emitters as specified in Angular style guides

Fix: b/258214773
Test: npm run build:all && npm run test:all
Change-Id: I05abb10a9c78ffc8c3208ba081251d068a17a5a7
26 files changed