Improve sorting by popularity in tag selector

Right now, every time we change tags, we count their popularity by resources in `TagsSelectorPresenter`.
We can collect this statistics in `StatsStorage` and use it right away
But before that, we need to make sure that statistics are collected correctly.
For example, deleting a resource without our app. In this case, we need to reduce popularity of tags of this resource.
```
private fun sortByPopularity(
tagsOfSelectedResources: List,
tagsOfUnselectedResources: List,
tagItemsByResources: Map>
) {
val tagsOfSelectedResPopularity = Popularity
.calculate(tagsOfSelectedResources)

val tagsOfUnselectedResPopularity = Popularity
.calculate(tagsOfUnselectedResources)

val tagsPopularity = Popularity
.calculate(tagItemsByResources.values.flatten())
```

Start by tracing tag changes through TagsSelectorPresenter, then inspect StatsStorage and Popularity.calculate to understand how popularity is currently derived. Verify the statistics collection path for resources deleted outside the app; done means tag popularity remains correct and the selector can use the collected statistics instead of recounting resources.

Written by the indexing model from the issue text.