Add support for Pontus-X Testnet #1833
Description
Add support for the Pontus-X testnet, having the following parameters (link to the documentation here):
chainId: 32457,
network: 'pontus-x-testnet',
nodeUri: 'https://rpc.test.pontus-x.eu',
metadataCacheUri: 'https://aquarius.pontus-x.eu',
providerUri: 'https://provider.test.pontus-x.eu',
subgraphUri: 'https://subgraph.test.pontus-x.eu',
explorerUri: 'https://explorer.pontus-x.eu/testnet/pontusx',