[webkitbugspy] Implement ability to perform Radar search queries.

rdar://117214203
https://bugs.webkit.org/show_bug.cgi?id=263383

Reviewed by Jonathan Bedard.

Allows callers to perform Radar search queries as part of `webkitbugspy.Radar`.

* Tools/Scripts/libraries/webkitbugspy/webkitbugspy/radar.py:
(Tracker):
(Tracker.search): Perform Radar search from passed query parameters.

Canonical link: https://commits.webkit.org/270738@main

Tools/Scripts/libraries/webkitbugspy/webkitbugspy/radar.py

@@ -546,3 +546,17 @@ def clone(
         if assign:
             result.assign(self.me())
         return result
+
+    # FIXME: This function is untested because it doesn't have a mock.
+    def search(self, query):
+        if not query or len(query) == 0:
+            raise ValueError('Query must be provided')
+
+        radars = self.client.find_radars(query, return_find_results_directly=True)
+        issues = []
+        for radar in radars:
+            if radar.id:
+                issue = Issue(id=radar.id, tracker=self)
+                issues.append(issue)
+
+        return issues