[Feature]: Implement IErc165 for All Contracts

[0xNeshi]

What is the feature you would like to see?

We can implement this as a "convenience" impl for users who may wish to easily support IErc165 while using our contracts.

This implementation would not be part of the ABI unless the user of the library makes their intention to make it so explicit by declaring a supports_interface method in their inheriting contract(s).

TODO:

• implement IErc165 for all base contracts where it might be missing
• implement IErc165 for all extensions/utils where it might be missing
• add unit tests (for inspiration see

  rust-contracts-stylus/contracts/src/token/common/erc2981.rs

  Lines 864 to 883 in a4d70bc

  	fn interface_id() {
  	let actual = <Erc2981 as IErc2981>::INTERFACE_ID;
  	// Value taken from official EIP
  	// https://eips.ethereum.org/EIPS/eip-2981#checking-if-the-nft-being-sold-on-your-marketplace-implemented-royalties
  	let expected = 0x2a55_205a;
  	assert_eq!(actual, expected);
  	}
  	#[motsu::test]
  	fn supports_interface() {
  	assert!(Erc2981::supports_interface(
  	<Erc2981 as IErc2981>::INTERFACE_ID.into()
  	));
  	assert!(Erc2981::supports_interface(
  	<Erc2981 as IErc165>::INTERFACE_ID.into()
  	));
  	let fake_interface_id = 0x12345678u32;
  	assert!(!Erc2981::supports_interface(fake_interface_id.into()));
  	}

  )

We don't need to update examples or docs.

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[B1n4ryR41nb0w]

Hello, can I get it assigned and have a go at it, please?

[bidzyyys]

Hey @B1n4ryR41nb0w!
Thanks for your interest in contributing to our library 🚀
If you have any questions around scope, feel free to ask me or @0xNeshi.