read runtime version from code wasm custom sections

[qdm12]

For newer runtimes, the runtime version can now be obtained from the WASM custom sections from the wasm code, and there is no longer a need to instantiate the full runtime to check its version.

For context:

• https://github.com/w3f/polkadot-spec/issues/524
• https://github.com/paritytech/substrate/issues/7327
• https://github.com/paritytech/substrate/pull/8688

Note reading the runtime version by instantiating it and calling Core_version still need to be supported for older runtimes.

So the process should be:

1. try to find versions from the wasm custom section
2. fallback to instantiating + calling Core_version on the instance