v0.8.0

Added

• Add a metrics dashboard to the Sidekiq web UI, with job execution middleware, histogram-based recording, caching, and CSV/JSON export, thanks @antarr.
• Add Sidekiq.testing and Sidekiq::TestMode for inline job execution in specs.

Changed

• Remove the kemal-csrf dependency; it was merged into kemal-session.
• Update CI workflow and badge to point to main.
• Update URLs in README.

Fixed

• Fix deprecation and ameba linter warnings, and compilation warnings in examples.