Add "Trending posts" (statuses) feed (#4007)

Add "Trending posts" (statuses) feed.

This feed is a good source of interesting accounts to follow and,
personally, a sort of "Front page of the Fediverse".

Since #3908 and #3910 (which would provide a more thorough, albeit
complex, access to trending things) won't get merged, I'd like to
address this missing feed by simply adding another tab/feed.

~~If desired, I can move the second commit (fixing lint) to another
PR.~~

## Screenshots
### Tab
<img
src="https://github.com/tuskyapp/Tusky/assets/1063155/6a71a97e-673e-44c7-b67d-9b1df0bed4f5"
width=320 /> <img
src="https://github.com/tuskyapp/Tusky/assets/1063155/9bf60b23-d2f3-4dd8-8af6-e96647b02121"
width=320 />

### Activity
<img
src="https://github.com/tuskyapp/Tusky/assets/1063155/4e07dea3-d97f-42c6-8551-492a3116fcfa"
width=320 /> <img
src="https://github.com/tuskyapp/Tusky/assets/1063155/ad00a134-d622-43f4-8305-84cfa7fed706"
width=320 />

app/src/main/java/com/keylesspalace/tusky/network/MastodonApi.kt

@@ -848,4 +848,10 @@ interface MastodonApi {
 
     @GET("api/v1/trends/tags")
     suspend fun trendingTags(): NetworkResult<List<TrendingTag>>
+
+    @GET("api/v1/trends/statuses")
+    suspend fun trendingStatuses(
+        @Query("limit") limit: Int? = null,
+        @Query("offset") offset: String? = null
+    ): Response<List<Status>>
 }