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!