Feature/better nft events

[mattdean-digicatapult]

Consolodates pallet-simple-nft events into a single ProcessRan event. Adds indexing to the event so we can look it up easily. Also integrates the latest version bumps from #123

[github-actions]

This PR updates the following pallets - they may also require updates to their extrinsic weights:
process-validation symmetric-key

For the author and any reviewers:

• consider whether the changes could significantly affect the weight of any extrinsics
• consider whether benchmarks need updating to correctly cover weight variations over inputs

For a guide on running benchmarks to update weights see calculating weights