Searching rooms in a space should also find rooms by alias

**Is your feature request related to a problem? Please describe.**
Rooms may have a certain name for historical reasons, and benefit from having aliases (local or not) that make their purpose more explicit.
For instance a "Home" room may be also have a #all-hands:server.tld alias.

When searching for rooms in a space, it would be helpful to also search these aliases for a match, not just searching the room name.

**Describe the solution you'd like**
Type search terms in the space room search, find rooms that match at both the room name and alias level.

**Describe alternatives you've considered**
Add other tags / terms that might be searched for in the room's description and return search results matching room descriptions.

**Additional context**
N/A

Start at the space room search described in the issue and trace how room names are currently matched. Confirm which Element client owns that search and how aliases are represented; done means matching aliases as well as room names, with coverage for both matching paths.

Written by the indexing model from the issue text.