[feat]: Add grouping in tree for system keyspaces, similar to virtual keyspaces

[millerjp]

We should add a new grouping "System Keyspaces" on the tree and group the system keyspaces under this (as in virtual keyspaces).

These are the system keyspaces to add here:

• system
• system_schema
• system_auth
• system_traces
• system_distributed

Also, order all the keyspaces alphabetically ascending so the order is predictable see #387 and #391 in all the groups

[mhmdkrmabd]

Working on that