Wasm encoding is not defined on the json schema

[aborgna-q]

The wasm field in encoded operations does not appear in the schema.
https://github.com/CQCL/tket/blob/develop/schemas/circuit_v1.json

As @johnchildren mentions in CQCL/tket-json-rs#61 (comment),

Honestly if they aren't too set on the schema yet there are some improvements I'd perhaps like to make such as renaming wasm_file_uid to uid

[CalMacCQ]

Is this issue causing problems for tket-json-rs?

[aborgna-q]

We merged a definition that "looks to be alright" in CQCL/tket-json-rs#61, but since the source of truth is deep in the cpp code there is no assurance that it is correct nor that it will remain correct.

A schema validation would probably fail too...