Build command

[jonsnyder]

Description

Currently, the only way to build a test library is to run the sandbox and then get /launch...js. This adds a command to the CLI and lib version to build the test library. Additionally, you can pass a container object to the library build method. This greatly simplifies Web SDKs runtime tests. See https://github.com/adobe/reactor-extension-alloy/pull/295/files

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[jonsnyder]

Closed in favor of #93