FLIP 255: Cadence WebAssembly API

[darkdrag00nv2]

Fixes #255

[KshitijChaudhary666]

Hi @darkdrag00nv2 - This FLIP is not reflected on FLIP project tracker. Can you pls follow the process outlined in https://github.com/onflow/flips? Specifically the following would help show the FLIP on the project tracker-

• Create an issue by using one of the FLIP issue templates based on the type of the FLIP - application, governance, cadence or protocol
• The title of the issue should be the title of your FLIP, e.g., "Dynamic Inclusion fees". Submit the issue. Note the issue number that gets assigned
• Use the issue number generated in step 2 as the FLIP number on this PR. And mention the FLIP issue by copying the GitHub URL or the issue in the comment section here

Thank you!

[turbolent]

Looks good!

As we're finishing work on Cadence 1.0, we can finally come back to proposals like this. Thank you for your patience!

I left some comments and suggestions, and am happy to apply suggested edits and add remaining details. Does that sound good to you @darkdrag00nv2 ?

Once we addressed the outstanding issues, we can schedule to vote on it in the next WG call