2023-01-17: Support `lts/-X` Version Notation

[dsanders11]

Is your feature request related to a problem? Please describe.

I want to be able to specify versions in CI configs which are relative to the current LTS version, so that I can test against multiple LTS versions without needing to change the CI config when new versions are released.

Describe the solution you'd like

I want to be able to use lts/-X version notation. This notation is supported by nvm, and allows for specifying offsets from the current LTS version, e.g. currently LTS is v18, so lts/-1 is v16.

Supporting the same notation as nvm would be helpful for consistency with cross-platform CI jobs.

Describe alternatives you've considered

I have not considered any alternatives.

[coreybutler]

Please see https://github.com/coreybutler/nvm-windows/wiki/New-Features

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[coreybutler]

I'm not sure how much interest there still is in this feature. It's something we might be able to add to fit in before the v2 GA release though if anyone still cares.