devtools memory section more fine-grained parameters control

currently there's a lot of parameters on legend and the only option to hide or show some of them is "Android Memory" button, which adds additional chart

i propose that in this legend menu, we could click on some parameters to toggle them and see the exact information about the memory usage we need, because now both of the charts a really cluttered

with this change it probably would be also valid:
1. to merge two charts into one. also i noticed on macos there's already only one graph, apparently because there are fewer parameters there
2. keep the "Android Memory" button, which would just reveal/hide the approriate parameters on chart



flutter doctor -v

```
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! Doctor found issues in 1 category.
```

Start with the DevTools memory section and its legend and charts. Review how the Android Memory button currently controls the displayed parameters, then define the interaction and chart behavior for individually toggling parameters, including the proposed single-chart arrangement. Done means the memory view can show only the selected information without clutter.

Escrito por el modelo de indexación a partir del texto del issue.