fix credentials

[alexcos20]

Fixes #804

Changes proposed in this PR:

Refactor credential handling and access list checks

• Updated config.json to set lists to null instead of empty arrays for better clarity.
• Bumped @oceanprotocol/ddo-js version from 0.1.4 to 0.2.0 in package.json and package-lock.json.
• Modified OceanNodeStatus interface to use a structured object for allowedAdmins.
• Introduced checkAddressOnAccessList utility for validating access list credentials.
• Refactored credential checking logic in checkCredentials to support blockchain checks.
• Updated code to utilize the new credential checking methods, enhancing access control mechanisms.
• Use proper accessLists ( "chainId":[contracts]) for compute