Use mainnet method registry for other networks

**Describe the bug**
According to the document, we have to register function signature on the mainnet registry contract for metamask to display function name rather than contract interaction on the step to sign a transaction. But after we register the signature, the function name will only show up when we're on mainnet.

**Expected behavior**
Should fetch the data from mainnet registry contract even when users are using other networks.

Start by tracing how the mainnet registry contract is queried during the transaction-signing flow, especially when the user is connected to another network. Verify the current behavior for a registered function signature on a non-mainnet network and confirm that the function name is displayed instead of a generic contract interaction.

Written by the indexing model from the issue text.