[multi-delegation] integrate mathe wallet and ledger to multi-delegation dashboard

[MaggieWang-Harmony]

as we are opening the number of seats to 640 and want to encourage people to diversify their portfolio, we need to enable the multi-delegation feature.
the current multi-delegation dashboard only integrates with harmony wallets, which leads to the fact that we need to keep it and the current staking.harmony.one at the same time.

@yelllowsin can you assign this issue to @potvik