Support WM & SF dumps with ADB Connect, minor fixes

Added support for capturing WindowManager and SurfaceFlinger dumps
directly from the browser.

Fixed DataFilter errors on non-transaction data files.
Fixed Timeline behaviour on empty data list.

Bug: 140374376
Test: yarn run dev & python3 adb_proxy/winscope_proxy.py
Change-Id: I0d47ec36e1e769b856365d2a36c91bfb1f831b71