use colors to help readability of trace lines

[typeholes]

use diagnostics colors for duration and type counts in UIi trace lines. respect the threshold settings in config. Probably easiest to annotate the trace line with color flags before sending to UI

explore other uses of color, like color coding the trace node names

[typeholes]

need to check which css variables exposed by vscode are semantic matches for the information we want the colors to represent so that vscode theming is respected