feat(wallet-lib): optional sync of the account

[markin-io]

Issue being fixed or feature implemented

Introduce synchronize: bool flag into getAccount() to allow users get account info without the need to sync with the chain first. Useful in client applications

What was done?

How Has This Been Tested?

• CI
• Dash Web Extension

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[shumkov]

👍