SFDX: Add first class support for package lifecycle commands

[Justin Julicher]

It would be great to have the following as first class functions in the IDE:

1. forceversion:create
2. forceversion:install
3. forceversion:promote

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[Aidan Harding]

Agreed, you could have some really nice enhancements compared to the command line e.g.

Read the sfdx-project.json file and suggest the package names to install

Fire desktop notifications at the end of long-running operations

Have the ability to bootstrap a new scratch org by installing dependencies, pushing code, then building the OST

[Scott Wells]

This is one of several enhancement requests around package management via the Salesforce CLI. They should rationalized and consolidated as appropriate.