feat: add secure channel server support (#861)

* feat: add secure channel server support

* Restore CLI overrides for example websocket helpers

* test: update generate snapshots for websocket metadata

* fix: regenerate storybook.requires.ts with default non-secure config

The generated file was committed with secured: true and port: 7443,
which would confuse contributors cloning without the secure env var.

* style: fix prettier formatting

* refactor: deduplicate test helpers, extract TLS fixtures, share WebsocketsOptions

- Merge channelRequestWithBody into channelRequest with optional body param
- Move inline TLS key/cert to __fixtures__/*.pem files
- Extract WebsocketsOptions to src/types/index.ts, import in metro and repack

* Remove custom secure example ports

* add secure option for wss/https on the channel server