fix(providers): add "nibiru" as chain with chainId 6900 to match ethereum-lists/chains#176

Unique-Divine wants to merge 2 commits intoDefiLlama:masterDefiLlama/defillama-sdk:masterfrom

Unique-Divine:ud/nibiru-providerUnique-Divine/defillama-sdk:ud/nibiru-providerCopy head branch name to clipboard