Provide default values for the api version in the create task

[hlxid]

Description

As suggested by @derNiklaas on discord we should have the current api version as the default in the sbt create task. The user shouldn't have to look at the sbt file of the api manually.

References

suggestion on discord

[hlxid]

Implemented in 20ec743. The prompt now looks like this:

Please specify the major version of the api. Default is the current version (3).
Major api version >

It will fallback to the old prompt if the api project hasn't been loaded by sbt, e.g. because of a missing sbt fetch or if it isn't downloaded locally.