ui: add SearchView and SearchQueryState

Introduce a new view for searching for notes.

Fixes: https://linear.app/damus/issue/DECK-510/initial-search-query-view
Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/src/ui/mod.rs

@@ -11,6 +11,7 @@ pub mod note;
 pub mod preview;
 pub mod profile;
 pub mod relay;
+pub mod search;
 pub mod search_results;
 pub mod side_panel;
 pub mod support;