When the user clicks the field, show a list of suggested services to choose from.

[hieunguyen2307]

In the current version flora-0.1.1-linux-amd64.deb, the Service Call panel does not show a suggestion dropdown when I click the Service name field.
Foxglove Web has this feature (see the image below).

I hope the next update can add this feature.
It would be very helpful if the app could show a list of available services when the user clicks the field.

Also, the JSON shown in the panel should match the message type of the selected service automatically.
This would make it easier for users to call services without writing the JSON by hand.