Release v2.0.0 beta.1

IMPORTANT: This adds a new major version (v2)

• Add: Call by the branch to activity calls.
• Add: Generate branch-wise stats.
• Add: New header service-branch to call activity on a specific branch.

Though this does not include any breaking change, it does have implementation changes. To get the latest updates, users must use corelab.mkcl.org/MKCLOS/coredevelopmentplatform/corepkgv2/v2 as an import path.