speculative_loading 1.0.0

Changes since 1.0.0-beta2:
- Add an enable switch with an update path for sites on beta
- Add SpeculationRules plugin support: plugin exclusions merge into the denylist and extra rules append to the mode rule list
- Fix: alter hook now receives the merged site list so paths can be added or removed
- Fix: default denylist now covers password pages and applies the node edit, user edit, reset and confirm paths
- Fix: skip administration routes and tag pages with module config so Internal Page Cache and Dynamic Page Cache invalidate correctly
- Fix: normalize invalid mode and eagerness values to safe defaults