Type generation from `v14` metadata with `scale-info` types

[ascjones]

paritytech/substrate#8615 introduces a new version of substrate metadata which includes scale-info type information.

Here is an example of the json metadata generated from a polkadot dev instance from this branch paritytech/polkadot#3336.

There is already some code for contracts https://github.com/polkadot-js/api/blob/master/packages/api-contract/src/MetaRegistry.ts which generates types from this metadata so this could be a starting point.

It would be good to get some early feedback on the format/contents of this new metadata while it is still easy to change. The v14 metadata structure can be seen here: https://github.com/paritytech/frame-metadata/blob/main/frame-metadata/src/v14.rs.

[polkadot-js-bot]

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