Ability to create a Github discussion thread when a release version published

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

Description

When releasing a version, we have the option to --create-release github which creates a new Release in Github. When we create a Release manually in Github we have an option to Create a discussion for this release, but this is not possible currently with lerna command options.

Motivation

As GitHub added this feature relatively new, and manually we were able to create discussion, it is good to automate it during the release process

Suggested Implementation

To start with, add an option to lerna version command like --crerate-github-discussion which accepts a value of one of the Discussion types. This option should be applicable only when --create-release github option is passed

Alternate Implementations

Alternatively, add a property in lerna.json under the version command called createGithubDiscussion that accepts a boolean

Review the lerna version command and its existing --create-release github path, then compare them with the proposed lerna.json version configuration. Determine how a GitHub release discussion type should be selected and which interface is appropriate. Done means publishing a GitHub release can optionally create the requested discussion without affecting releases that do not enable the option.