kctrl: default version flag to ">= 0.0.0" for installations

[100mik]

Describe the problem/challenge you have
[A description of the current challenge that you are experiencing.]
A traditional package manager would pick the latest version if one is not specified. kctrl should default to using a constraint that picks the maximum version in case a version is not specified.

Describe the solution you'd like
[A clear and concise description of what you want to happen. If applicable a visual representation of the UX.]
We should make the version flag optional and default the value to ">= 0.0.0". We should however log a message to indicate that we are defaulting to this to call out the change in behaviour to older users who might have missed the flag.
For existing users, it is not a breaking change as not supplying this flag would lead to an error so far.

Updates should continue behaving as they have so far.

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