Spring Boot Project Generation Improvements

[e-dong]

Once we identify some areas of improvements, we can break it down to actionable issues.

Great job getting this started @dijub btw.

These are some things I noticed while testing it out!

General User Experience

• If a typo is made, the user has to start over.
• It would be good to allow the user to input just one character to make a choice, e.g. [j]ava, [k]otlin, [g]roovy
• A floating window like Mason / Telescope would be better, since it seems to be crammed in the lower bar.

Entering Spring Boot Version

This would be better as a dropdown
e.g.

The default 3.3.1.RELEASE doesn't exist in the available options
3.2.9.RELEASE and 3.3.3.RELEASE doesn't exist any more, it is 3.3.3 and 3.2.9

Ease of Setup

There is a dependency on using the spring-cli

There should be instructions in the readme that point them to here:
https://docs.spring.io/spring-boot/installing.html#getting-started.installing.cli

On failure, the message should not be printed that the project generation was successful.