Add keychain, peakvault and metamask signing functionality

src/App.vue

src/components/MetamaskExample.vue

src/components/onboarding/SelectWallet.vue

...omponents/onboarding/wallets/metamask/MetamaskConnect.vue

src/components/utilcards/MemoEncryptCard.vue

src/components/utilcards/SignTransactionCard.vue

src/stores/metamask.store.ts

src/stores/settings.store.ts

src/stores/wallet.store.ts

src/utils/wallet/abstraction.ts

src/utils/wallet/keychain/index.ts

src/utils/wallet/metamask/metamask.ts

src/utils/wallet/metamask/snap.ts

src/utils/wallet/peakvault/index.ts