[l2geth]: RPC doesn't support query block with unsafe, safe and finalized

[abelliumnt]

Describe the bug
Mantle rpc doesn't support query block with unsafe, safe and finalized.

To Reproduce
Steps to reproduce the behavior:

1. Open Postman
2. URL: https://rpc.mantle.xyz
3. Post Body

{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": ["safe", false],
    "id": 0
}

4. Click Send button
5. Check response:

{
    "jsonrpc": "2.0",
    "error": {
        "code": -32602,
        "message": "invalid argument 0: hex string without 0x prefix"
    },
    "id": 0
}

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots