feat(playground): Add support for multi-assets to playground 🛝

[michaeldev5]

Closes #527

[codecov]

Bundle Report

Changes will decrease total bundle size by 150 bytes (-0.02%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sdk-cjs-esm	459.45kB	367 bytes (-0.08%) ⬇️
xcm-router-esm	147.68kB	217 bytes (0.15%) ⬆️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
visualizator-be	100.00% <ø> (ø)
xcm-analyser	98.60% <ø> (ø)
xcm-api	97.09% <100.00%> (-0.01%)	⬇️
xcm-router	93.37% <100.00%> (+0.73%)	⬆️
xcm-sdk	94.90% <100.00%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
...m-api/src/x-transfer-eth/dto/x-transfer-eth.dto.ts	100.00% <100.00%> (ø)
...m-api/src/x-transfer-eth/x-transfer-eth.service.ts	100.00% <ø> (ø)
apps/xcm-api/src/x-transfer/dto/XTransferDto.ts	100.00% <100.00%> (ø)
packages/sdk/src/builder/evm-builder/EvmBuilder.ts	100.00% <100.00%> (ø)
...kages/sdk/src/nodes/xTokens/XTokensTransferImpl.ts	96.00% <100.00%> (+0.08%)	⬆️
...s/xcmPallet/ethTransfer/buildEthTransferOptions.ts	100.00% <100.00%> (ø)
...k/src/pallets/xcmPallet/ethTransfer/ethTransfer.ts	100.00% <100.00%> (ø)
...llets/xcmPallet/transfer/resolveOverriddenAsset.ts	100.00% <100.00%> (ø)
...xcm-router/src/transfer/buildTransferExtrinsics.ts	97.77% <100.00%> (+5.35%)	⬆️
...es/xcm-router/src/transfer/transferFromEthereum.ts	100.00% <100.00%> (ø)