ui: Memscope - Profiling support

[stevegolton]

This patch adds profiling support to the memscope dashboard.

• Addition of a new profile 'action' button along side each debuggable process in the process table.
• Profile session (sessions/profile_session.ts): Starts a new Java + native heap tracing session with an opinionated configuration recording into ring buffers.
• Profiling page (views/profile_page.ts): Displays the current status of the profiling session as well as some process stats taken from the live session data pertinent to the process being profiled. Features a cancel and stop & open button which stops and opens the trace in perfetto, switching back to the main timeline.

[github-actions]

🎨 Perfetto UI Builds

• 5c1cd57 (2026-05-08 14:34 UTC): https://storage.googleapis.com/perfetto-ci-artifacts/gh-25561334524-1-ui/ui/index.html
• 76d401c (2026-05-12 15:54 UTC): https://storage.googleapis.com/perfetto-ci-artifacts/gh-25745895695-1-ui/ui/index.html
• 175bfe0 (2026-05-13 13:24 UTC): https://storage.googleapis.com/perfetto-ci-artifacts/gh-25801824940-1-ui/ui/index.html