Initialize the API with metadata V15

[TarikGul]

rel: #5725
rel: #5845

This is Part 1 of a 2 part process.

Summary

This will Allow the API to initialize with metadata 15. Once this is finished, then I will ensure the runtime calls are decorated via this metadata.

TODO:

• Ensure at also works with _retrieveMetadata when applicable.
• Fix the inability to decode blocks.

[TarikGul]

I got api.at to also work with the above which is great. Looks like the PR is about done, and part 2 will be using this ground work to decorate the runtime calls using the metadata

[TarikGul]

I have found some issues with some historic runtimes that have the metadata api, but there is specific decoding issues, I see this issues specifically with runtime and lower 1000000 with kusama

[TarikGul]

Need to resolve this before it's ready:

packages/api/build/bundle.js → packages/api/build/bundle-polkadot-api.js...
(!) Unresolved dependencies
https://rollupjs.org/troubleshooting/#warning-treating-module-as-external-dependency
@polkadot/types/metadata/versions (imported by "packages/api/build/base/Init.js")
(!) Missing global variable name
https://rollupjs.org/configuration-options/#output-globals
Use "output.globals" to specify browser global variable 

fixed

[TarikGul]

The current issue with v15 - the new Metadata(registry, metadatav15Hex) breaks all decoding of blocks so the Metadata structure and decoding needs to be fixed before this can go in.

[TarikGul]

Registry is now fixed and decoding is good to go!

[polkadot-js-bot]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.