feat: excel import (#527)

* refactor: simplify excel import

* chore: add external deepmerge utility

* chore: create import map utilities

* chore: increase size limits on uploads

* style: small presentation tweaks

* feat: resolve times on excel import, refs #508

apps/client/src/features/modals/upload-modal/upload-options/ImportMapTable.module.scss

@@ -0,0 +1,33 @@
+@use '../../../../theme/v2Styles' as *;
+@use '../../../../theme/ontimeColours' as *;
+
+.importTable {
+  margin: 0.5rem;
+  height: fit-content;
+
+  thead {
+    color: $gray-500;
+    text-transform: uppercase;
+    width: 10em;
+  }
+
+  tr:hover {
+    background-color: $gray-50;
+  }
+
+  tbody {
+    td {
+      max-width: fit-content;
+    }
+  }
+}
+
+.label {
+  display: inline-block;
+  min-width: 6em;
+  font-size: $inner-section-text-size;
+}
+
+.input {
+  width: 100%;
+}