Add USDS in solanan stablecoins list

[loopy811]

Description:

Hello! I added USDS in solana stablecoins list.

[cursor]

PR Summary

Adds a new stablecoin entry to Solana tokens.

• Inserts USDS into tokens_solana_stablecoins.sql with address USDSwr9ApdHk5bvJKMjzff41FfuX8bSxdKcR81vTwcA, decimals=6, backing="Dollar-Pegged", name="Sky"

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