* Rename `provider` to `providerConfig`
The network controller `provider` state has been renamed to
`providerConfig`. This better reflects what this state is, and makes
this controller more closely aligned with the core network controller.
All references to the provider configuration have been updated to
prefer `providerConfig` over `provider`, to make the distinction clear
between a provider and provider config.
Closes#18902
* Add migration
* Support for Layer 2 networks with transaction fees on both layers
* Use variable name in transaction-breakdown
* Add comment on code source to ui/helpers/utils/optimism/fetchEstimatedL1Fee.js
* Fix unit tests
* Ensure values passed to are defined
* Fix activity log
