LibJS+WebContent+Browser+js: Implement console.group() methods

This implements:
- console.group()
- console.groupCollapsed()
- console.groupEnd()

In the Browser, we use `<details>` for the groups, which is not actually
implemented yet, so groups are always open.

In the REPL, groups are non-interactive, but still indent any output.
This looks weird since the console prompt and return values remain on
the far left, but this matches what Node does so it's probably fine. :^)
I expect `console.group()` is not used much outside of browsers.

Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h

@@ -240,6 +240,9 @@ namespace JS {
     P(getYear)                               \
     P(global)                                \
     P(globalThis)                            \
+    P(group)                                 \
+    P(groupCollapsed)                        \
+    P(groupEnd)                              \
     P(groups)                                \
     P(has)                                   \
     P(hasIndices)                            \