refactor: migrate to github gql api

src/api/graphql/list_pull_requests.graphql

@@ -0,0 +1,28 @@
+query PullRequestQuery($query: String!) {
+    search(query: $query, first: 10, type: ISSUE) {
+        issueCount
+        edges {
+            node {
+                __typename
+                ... on PullRequest {
+                    isDraft
+                    title
+                    state
+                    repository {
+                        name
+                        owner {
+                            __typename
+                            login
+                        }
+                    }
+                }
+            }
+            cursor
+        }
+        pageInfo {
+            startCursor
+            endCursor
+            hasNextPage
+        }
+    }
+}