fileInfo endpoint service name should be updated to match others (camelCase)

[paulo-ocean]

This needs to be aligned with all the others, and use camelCase
so, fileInfo instead of fileinfo
but before, we need to update corresponding service endpoint check on SDK (ocean.js and ocean.py)
on Ocean.js

public async getFileInfo(
    file: UrlFile | Arweave | Ipfs | GraphqlQuery | Smartcontract,
    providerUri: string,
    withChecksum: boolean = false,
    signal?: AbortSignal
...
const path = this.getEndpointURL(serviceEndpoints, 'fileinfo')
      ? this.getEndpointURL(serviceEndpoints, 'fileinfo').urlPath
      : null

References:
oceanprotocol/ocean.js#1831

UPDATE: SDK is now case insensitive for service names, we can restore this

[paulo-ocean]

closed on #520