We generally nest the `Builder` for `Foo` inside `Foo`. In this case,
there's already a `DefaultTrackSelector.Parameters.Builder` type visible
to a developer, it just happens to be the 'common'
`TrackSelectorParameters.Builder`, so using it is a bit weird. For
example this code snippet doesn't compile because
`DefaultTrackSelector.Parameters.Builder#build()` returns
`TrackSelectionParameters`. This CL fixes that problem and the code
snippet now compiles.
```java
DefaultTrackSelector.Parameters params =
new DefaultTrackSelector.Parameters.Builder(context).build()
```
#minor-release
PiperOrigin-RevId: 453215702
(cherry picked from commit 88162238)
