`CLUSTER NODES` command does not return the node hostname

**Version**: 5.0.7

**Platform**: Python 3.11.4 on Mac OS 14.0

**Description**:
The `CLUSTER NODES` command returns a dictionary with the nodes' IP. It does not have a field for the hostname if a hostname was supplied to the node on initialization. 

**Proposal**:
Add a "hostname" field to the `_parse_node_line` function response if the hostname, if there is one.
