Calculate reading time during feed processing

The goal is to speed up the user interface.

Detecting the language based on the content is pretty slow.

storage/entry_query_builder.go

@@ -226,6 +226,7 @@ func (e *EntryQueryBuilder) GetEntries() (model.Entries, error) {
 			e.content,
 			e.status,
 			e.starred,
+			e.reading_time,
 			f.title as feed_title,
 			f.feed_url,
 			f.site_url,
@@ -284,6 +285,7 @@ func (e *EntryQueryBuilder) GetEntries() (model.Entries, error) {
 			&entry.Content,
 			&entry.Status,
 			&entry.Starred,
+			&entry.ReadingTime,
 			&entry.Feed.Title,
 			&entry.Feed.FeedURL,
 			&entry.Feed.SiteURL,