feat(SPGNFT): add ERC-7572 contract-level metadata support

[sebsadface]

Description

This PR introduces ERC-7572 contract-level metadata support to SPGNFT and updates the existing contract-level metadata in IStoryNFT and BaseStoryNFT to comply with the ERC-7572 standard.

Key Changes

• Added IERC7572; both IStoryNFT and SPGNFT now inherit from IERC7572.
• Introduced a new _contractURI field in SPGNFTStorage, along with corresponding getter (contractURI) and setter (setContractURI) functions in SPGNFT.
• setContractURI in BaseStoryNFT now emits ContractURIUpdated event defined in IERC7572
• Minor cleanups:
  • Removed redundant inheritance in ISPGNFT.
  • Updated setter functions in SPGNFT to be external rather than public.

Test Plan

• Added tests for the setContractURI function in SPGNFT.
• Added assertions for contractURI in SPGNFT initialization and RegistrationWorkflows tests for CreateCollection.
  All new and existing tests pass locally.

Related Issue

• Closes Add support for contractURI in SPGNFT #83

Notes

This PR include interface changes to SPGNFT and createCollection function in RegistrationWorkflows