feat: Add initial support for Metadata V16 view_functions

[demoncoder-crypto]

Addresses #6133

[valentinfernandez1]

Thanks for putting this together, I appreciate the effort here.

That said, I think the approach might need to be rethought a bit. A lot of the files touched in this PR are auto-generated (they explicitly state // Auto-generated via yarn polkadot-types-from-defs, do not edit) and so editing them directly isn’t the right path.

Also, some of what’s being added here overlaps with the upcoming Metadata V16 PR so it probably makes more sense to wait until that lands, then build on top of it, otherwise we risk redoing work or introducing conflicts. Not saying that this effort isn't valuable but it might be a good idea to hold off until the Metadata 16 stuff is merged

[demoncoder-crypto]

Understood I will wait till metadata V16 Pr, also please tell on what changes or what tangent do you want me to implement the changes I am very willing to make the desired changes. Thanks :). @valentinfernandez1