v8.5.1

Contributed:

• Bump @substrate/connect to 0.7.5 (Thanks to https://github.com/wirednkod)

Changes:

• Adjust extrinsic inspect for signed/unsigned
• Add support for mmr_generateBatchProof RPC
• Add additional isCodec checks to error/event .is
• Add support for Vec<Option<X>> in typegen
• Update to latest Substrate, Kusama & Polkadot static metadata