fix(types): correct three ApiRocketChat return types

[arbazkhan971]

Summary

Fixes the three return-type bugs in ApiRocketChat from #381.

• getRoomIdByNameOrId was typed as Promise<RID> but returns the REST body (the existing test pins this: "answers its result untouched"). The signature now matches that body. Rocket.Chat.ReactNative does not call this helper, so I did not unwrap to an id (that would be a behavior change).
• channelInfo / privateInfo already unwrap .channel / .group. The as Promise<...> casts after await made the declared types Promise<Promise<...>>. They are now Promise<IChannelAPI> and Promise<IGroupAPI>.

Test plan

• Existing lib/api/__tests__/RocketChat.spec.ts still records current runtime (25/25)
• npm run lint
• npm run typecheck

Fixes #381

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