feat: add arg --generate-package-metadata

[eatradish]

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[what-the-diff]

PR Summary

• Introducing New Build Option in acbs-build Script
  A new option, 'bootstrap-ab-only', has been added to the acbs-build script. This gives users another way to manipulate and control their build process.

• Addition of bootstrap_ab_only Attribute to ACBSMain Class
  The ACBSMain class in the acbs/main.py file now includes a new attribute, 'bootstrap_ab_only'. This attribute plays a significant role in determining the behavior of several functions relating to the build process.

• Conditional Source Fetching and Autobuild Invocation
  The build_sequential method in the ACBSMain class now fetches sources and initiates the 'autobuild' process based on the status of the 'bootstrap_ab_only' attribute. This means that the method's behavior can now be switched based on user preference.

• Function for Displaying Autobuild Metadata
  A new function has been added to acbs/utils.py, titled 'start_general_autobuild_metadata'. Specifically designed to print comprehensive autobuild metadata when the 'bootstrap_ab_only' attribute is true.

• Conditional Build Capture Start in invoke_autobuild Method
  The invoke_autobuild method, also in acbs/utils.py, has been modified to start capturing build information based on the status of the 'bootstrap_ab_only' attribute. This makes the capture process more flexible by allowing it to respond to user input.