core&ui: add problem_config

Co-authored-by: undefined <i@undefined.moe>

packages/ui-default/pages/problem_config.page.styl

@@ -0,0 +1,23 @@
+.page--problem_config
+  .section--problem-sidebar-testdata
+    .problem-sidebar-testdata__detail
+      height: 270px
+      overflow-y: auto
+    
+    &.collapsed .collapsed--hidden,
+    &.expanded .expanded--hidden
+      display: none
+
+    &.collapsed .problem-sidebar-testdata__detail
+      display: none
+
+  .col--size
+    width: 80px
+  .col--operation
+    width: 40px
+
+  .textbox,.select
+    margin: 0
+  
+  .bp3-tab-panel
+    margin-top: 5px