Upgrade @metamask/chomp-api-service to version 2.0.0

A new major version of `@metamask/chomp-api-service`, 2.0.0, is now available. This issue has been assigned to you and your team because you code-own this package in the `core` repo. If this package is present in this project, please prioritize upgrading it soon to unblock new features and bugfixes.

Start by locating every use of @metamask/chomp-api-service in the metamask-mobile repository and inspect its current package declaration and integration points. Review the 2.0.0 release changes for compatibility requirements, then update the dependency and run the relevant project checks to confirm the upgrade works.

Written by the indexing model from the issue text.