[trace engine] Add Lighthouse's Lantern library

This is the culmination of isolating Lighthouse's Lantern library
(GoogleChrome/lighthouse#15841). The code in
this CL took Lantern as it now exists in Lighthouse, converted to
TypeScript, integrated its unit tests (Jest -> Karma conversion), and
resolved the majority of CDT's JavaScript linter errors.

There is no behavior change to CDT with this CL, besides TraceModel
exporting the Lantern module.

There is some refactoring work remaining, captured by
crbug.com/348449529

Bug: 335099340
Change-Id: Ib2bf64fc17d334859caca5c42bea1e276465d64c

config/gni/devtools_grd_files.gni

@@ -491,6 +491,7 @@ grd_files_release_sources = [
   "front_end/models/trace/handlers/handlers.js",
   "front_end/models/trace/helpers/helpers.js",
   "front_end/models/trace/insights/insights.js",
+  "front_end/models/trace/lantern/lantern.js",
   "front_end/models/trace/root-causes/root-causes.js",
   "front_end/models/trace/trace.js",
   "front_end/models/trace/types/types.js",
@@ -975,6 +976,7 @@ grd_files_debug_sources = [
   "front_end/models/timeline_model/TimelineProfileTree.js",
   "front_end/models/timeline_model/TracingLayerTree.js",
   "front_end/models/trace/EntriesFilter.js",
+  "front_end/models/trace/LanternComputationData.js",
   "front_end/models/trace/ModelImpl.js",
   "front_end/models/trace/Processor.js",
   "front_end/models/trace/TracingManager.js",
@@ -1024,6 +1026,29 @@ grd_files_debug_sources = [
   "front_end/models/trace/insights/RenderBlocking.js",
   "front_end/models/trace/insights/Viewport.js",
   "front_end/models/trace/insights/types.js",
+  "front_end/models/trace/lantern/BaseNode.js",
+  "front_end/models/trace/lantern/CpuNode.js",
+  "front_end/models/trace/lantern/LanternError.js",
+  "front_end/models/trace/lantern/Metric.js",
+  "front_end/models/trace/lantern/NetworkNode.js",
+  "front_end/models/trace/lantern/PageDependencyGraph.js",
+  "front_end/models/trace/lantern/TBTUtils.js",
+  "front_end/models/trace/lantern/metrics/FirstContentfulPaint.js",
+  "front_end/models/trace/lantern/metrics/Interactive.js",
+  "front_end/models/trace/lantern/metrics/LargestContentfulPaint.js",
+  "front_end/models/trace/lantern/metrics/MaxPotentialFID.js",
+  "front_end/models/trace/lantern/metrics/SpeedIndex.js",
+  "front_end/models/trace/lantern/metrics/TotalBlockingTime.js",
+  "front_end/models/trace/lantern/metrics/metrics.js",
+  "front_end/models/trace/lantern/simulation/ConnectionPool.js",
+  "front_end/models/trace/lantern/simulation/Constants.js",
+  "front_end/models/trace/lantern/simulation/DNSCache.js",
+  "front_end/models/trace/lantern/simulation/NetworkAnalyzer.js",
+  "front_end/models/trace/lantern/simulation/SimulationTimingMap.js",
+  "front_end/models/trace/lantern/simulation/Simulator.js",
+  "front_end/models/trace/lantern/simulation/TcpConnection.js",
+  "front_end/models/trace/lantern/simulation/simulation.js",
+  "front_end/models/trace/lantern/types/lantern.js",
   "front_end/models/trace/root-causes/LayoutShift.js",
   "front_end/models/trace/root-causes/RootCauses.js",
   "front_end/models/trace/types/Configuration.js",

front_end/BUILD.gn

@@ -132,6 +132,7 @@ group("unittests") {
     "models/trace/handlers:unittests",
     "models/trace/helpers:unittests",
     "models/trace/insights:unittests",
+    "models/trace/lantern:unittests",
     "models/trace/root-causes:unittests",
     "models/trace/types:unittests",
     "models/workspace:unittests",

front_end/models/trace/BUILD.gn

@@ -10,6 +10,7 @@ import("../visibility.gni")
 devtools_module("trace") {
   sources = [
     "EntriesFilter.ts",
+    "LanternComputationData.ts",
     "ModelImpl.ts",
     "Processor.ts",
     "TracingManager.ts",
@@ -23,6 +24,7 @@ devtools_module("trace") {
     "handlers:bundle",
     "helpers:bundle",
     "insights:bundle",
+    "lantern:bundle",
     "root-causes:bundle",
     "types:bundle",
   ]
@@ -47,7 +49,6 @@ devtools_entrypoint("bundle") {
     "../../services/trace_bounds/*",
     "../../services/tracing/*",
     "../../testing/*",
-    "../../testing/*",
     "../../ui/components/docs/*",
     "../../ui/legacy/components/utils/*",
     "../timeline_model/*",