feat: Show Staked ETH position in mobile homepage along with other tokens

[nickewansmith]

Explanation

What is the current state of things and why does it need to change?

• Currently the metamask-mobile app using the assets-controllers to get information about account token balances. We need to be able to support getting a new type of asset on mainnet and holesky chains, Staked Ethereum, which is not a token but represents the amount of ETH staked using our products.

What is the solution your changes offer and how does it work?

• We update the AssetContractController with a new method, getStakedBalanceForChain, which gets staked ethereum balances per account from the Stakewise vault contract. We update the AccountTrackerController with options to includeStakedAssets and to add a getStakedBalanceForChain method.
• We bind AssetContractController.getStakedBalanceForChain to getStakedBalanceForChain option property in metamask-mobile code and then set includeStakingAssets option to the boolean feature flag for ETH Staking on Mobile.
• We use the AccountTrackerController state in mobile to update the account balance and now, if enabled the stakedBalance as well.

Are there any changes whose purpose might not obvious to those unfamiliar with the domain?

• We don't want to show stakedBalance if not on a supported network, and so return undefined vs defaulting to zero hex. If there is an error and we are on a supported network, we want to default to zero hex.

If your primary goal was to update one package but you found you had to update another one along the way, why did you do so?

• There is 1 package affected

If you had to upgrade a dependency, why did you do so?

• No need to update dependency

References

Are there any issues that this pull request is tied to?

• Relates to https://consensyssoftware.atlassian.net/browse/STAKE-817

Are there other links that reviewers should consult to understand these changes better?

• feat: add staked ETH to metamask mobile homepage and account list menu metamask-mobile#12146 PR to MM mobile with patched assets-controllers@38.3.0

Are there client or consumer pull requests to adopt any breaking changes?

• No

Changelog

@metamask/assets-controllers

ADDED: AssetsContractController.getStakedBalanceForChain method to get staked ethereum balance for an address
ADDED: AccountTrackerController options includeStakedEthereum and getStakedBalanceForChain for turning on staked balance functionality and providing a method to do so

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[amitabh94]

Just some questions but overall LGTM!

[amitabh94]

LGTM!

[bergeron]

Approving to unblock staking features in the short term. We'll likely want to revisit this and optimize it via account API or multicalls in the future.