Add type_username option (closes #891) (#1012)

## What are the changes about?

Add an option to allow user manually input username, instead of selecting from a list of discovered users.

I have not tested the changes yet since I wasnt able to get it build locally. Will try to resolve this asap.

## What existing issue does this resolve?

#891

## Pre-requisites

- [ ] I have tested & confirmed the changes work locally
- [x] I have run `zig fmt` throughout my changes

Co-authored-by: HigherOrderLogic <73709188+HigherOrderLogic@users.noreply.github.com>
Co-authored-by: AnErrupTion <anerruption@disroot.org>
Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/1012
Reviewed-by: AnErrupTion <anerruption+codeberg@disroot.org>

res/config.ini

@@ -375,6 +375,10 @@ start_cmd = $CONFIG_DIRECTORY/ly/startup.sh
 # Center the session name.
 text_in_center = false
 
+# If true, user will need to manually type username instead of selecting from the list
+# of discovered users
+type_username = false
+
 # Default vi mode
 # normal   -> normal mode
 # insert   -> insert mode