Support constant expressions as index attribute variant #551
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This pull request introduces the capability to use constant expressions as index attribute variants for enum encoding, addressing the demand from issue paritytech/polkadot-sdk#2665. This update allows developers to declare pallet indices as constants when constructing a runtime.
The uniqueness of constant expression indices is ensured at compile time with
find_const_duplicate. Due to limitations in Rust's procedural macros, a runtime check approach is adopted to ensure that indices adhere to the u8 range. UI tests have been included to cover various scenarios, ensuring that the checks function as expected.