WALLET, UI: Display pending transactions (tansfer offiers)

[stas-sbi]

Wallet UI should provide a way to see initiated transactions (transfer offers) before they get accepted.

The related API endpoint:

 WALLET_AUTH='xxx'
WALLET_URL=https://wallet.sv.global.canton.network.sv-nodeops.com
curl -s -H "Authorization: $WALLET_AUTH" "$WALLET_URL/api/validator/v0/wallet/transfer-offers" | jq .

[stas-sbi]

Moved to hyperledger-labs/splice#435