Add an indication of why a package needs a new version when running `lerna version` or `lerna publish`

• I'd be willing to implement this feature (contributing guide)

Description

Add an indication of why a given package needs a new version number. This could take the form of a text in parenthesis showing (source change) (when the source of the package has been changed since the last version) or (dependency update) (a dependency of the package will have a new version after the command is executed)

Motivation

When running lerna version in monorepos with a lot of dependencies between packages it is easy to forget which one uses which. This can lead to incomprehension when a package you know didn't change asks for a new version number.

Suggested Implementation

This could take the form of a text in parenthesis showing (source change) (when the source of the package has been changed since the last version) or (dependency update) (a dependency of the package will have a new version after the command is executed)

Ideally the feature should be enabled/disabled with a --flag or a setting in lerna.json (and maybe enabled by default but that's not for me to decide)

if @namespace/package1 has been changed and @namespace/package2 depends on it then the stdout would look like :

yarn exec lerna version
lerna notice cli v8.1.4
lerna info versioning independent
lerna info Looking for changed packages since @imaios-js/anatomy@2.7.10
? Select a new version for @namespace/package1 (currently 1.0.6) Patch (1.0.7) (source change)
? Select a new version for @namespace/package2 (currently 1.0.6) Patch (1.0.7) (dependency update)

Changes:
 - @namespace/package1: 1.0.6 => 1.0.7
 - @namespace/package2: 1.0.6 => 1.0.7

Start at the lerna version and lerna publish command entry points, then inspect how changed packages and dependent version bumps are selected; the issue provides no file or test path. Done means package prompts or output identify source changes versus dependency updates, with behavior controllable through a flag or lerna.json setting.