feat: add account discovery to MultichainAccountWallet and providers

[hmalik88]

Explanation

EvmAccountProvider

1. discoverAndCreateAccounts method added to perform discovery and return the created account. The method will add an account to the keyring and remove it (except for groupIndex 0) if it is found there is no transaction history.
2. getEvmProvider method was added to grab the provider from the NetworkController.

SolAccountProvider

1. discoverAndCreateAccounts method added to perform discovery and return the created account. This method does not create an account if discovery yields no accounts.
2. Added a #getKeyringClientFromSnapId method that initializes the keyring client into a newly added #client property.

MultichainAccountWallet

1. discoverAndCreateAccounts method added to act as an orchestrator for provider discovery. This method "fast-forwards" lagging providers to the highest groupIndex being processed by a provider. At the end of discovery, it will sync the wallet and then align all created groups. The method returns only the discovered accounts (for consumption of the clients' metrics).

References

N/A

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 communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[fabiobozzo]

LGTM