[almost done] Next.js 15 support

[better-salmon]

Summary by CodeRabbit

• New Features

  • Added a Redis-based cache handler with pub/sub tag expiration support and a new cache handler that performs no operations.
  • Introduced advanced cache handler utilities for remote stores and improved cache management options.
  • Implemented new helper utilities for tag and age estimation handling.

• Bug Fixes

  • Improved error handling and type safety in cache handlers.
  • Enhanced timeout management for Redis operations.
  • Fixed and clarified return types across multiple components and functions.

• Refactor

  • Streamlined and modernized module imports/exports to ES module syntax.
  • Simplified and unified cache handler APIs, removing deprecated and redundant files.
  • Consolidated and improved cache handler logic, including removal of legacy caching strategies.

• Chores

  • Upgraded dependencies and development tooling across the project.
  • Updated TypeScript, ESLint, and Prettier configurations for stricter checks and consistency.
  • Removed deprecated packages, configuration files, and documentation for obsolete modules.

• Tests

  • Added comprehensive tests for new utilities and removed outdated test suites.

• Style

  • Standardized code formatting and updated editor/formatter settings.

• Documentation

  • Updated and removed documentation to reflect the new cache handler architecture and utilities.