feat: update EventBus to use CloudEvents for event publishing and sub…

…scribing

feat: update EventBus interface to support topic-based publishing and…

… subscribing with options

feat: add PagingMiddleware for extracting and managing paging paramet…

…ers in HTTP context

refactor: enhance LoadConfig and LoadConfigByKey functions to support…

… default values

feat: add LoadConfigByKey function for enhanced configuration loading…

… with defaults

refactor: rename the httpserver to http

refactor: migrate authentication logic to security package and implem…

…ent token-based middleware

refactor: add DB dependency to Options and introduce WithDB option

refactor: rename database package to db for consistency

refactor: introduce transport package with HTTP and gRPC server abstr…

…actions and refactor web package