[Upgrade Tool] Version Targeting Strategy V2

[Convly]

What does it do?

• Default the CLI's target to next
• Add the exact mode, which allows targeting a single upgrade when specifying a target in the form "x.x.x"
• Accept versions lower than the current one in exact mode
• Add the current and next target options
• Modify the behavior of major, minor and patch upgrades
  • major now targets the current or next major (current +1), + its latest minor andpatch
  • minor now targets the current major, the current or next minor (current +1), + its latest patch
  • patch now targets the current major, the current minor and the current patch + 1

Why is it needed?

• Making the targeting strategy more consistent and user friendly
• Allow running atomic upgrades
• Allow running previous upgrades

[innerdvations]

LGTM! Like we talked about earlier, the actual flow will be different, but it'll be great to have all this flexibility to design the tool with!