Upgrade rpctypegen to new Borsh Schema format

[MaksymZavershynskyi]

rpctypegen generates Borsh schema in TS format for all RPC errors.

Now that we have implemented BorshSchema macro in near/borsh#57 and near/borsh#56 we can use #[derive(BorshSchema)] to generate schema for RPC errors and reduce our code base. We would also need to do two more things:

• Switch nearlib to new Borsh Schema format that is slightly different from the one introduced by rpctypegen (this can be easily done after we upgrade borsh TS/JS to new Borsh Schema format, see: Consolidate and update Borsh for TS/JS near-api-js#252)
• Add a single executable in nearcore/tools that has a hardcoded list of error types. The executable would iterate over the error types and for each of them generate Borsh Schema using BorshSchema trait it then would dump the schema into a file that we can hardcode in nearlib.

[frol]

Borsh schema does not necessarily match the JSON schema (e.g. some values can be base64-encoded, some fields/enum variants are renamed, etc). Unfortunately, I don't think it is feasible to try to fit Borsh schema for JSON schema. Please, reopen if you think otherwise.

[MaksymZavershynskyi]

Borsh schema is not Borsh-specific. We call it Borsh schema because it is defined in Borsh library but it can be used by many serializers. Our current schema generated by rpctypegen has nothing specific to JSON either. The point of the proposed changes is to reconcile the schemas that we currently use in nearlib. I am reopening this issue. However, I don't think it is blocking for the Mainnet. Therefore I am removing it from the Mainnet release and moving it to IceBox. I am also doing the same with the Epic.

[frol]

Nice! Then, for the future context, we need to make sure that whatever schema-generation we use should respect the serialization annotations (currently, we extensively use serde renamings, enum representations, and skips). There are OpenAPI spec generators for serde out there for inspiration: https://docs.rs/rweb/0.4.3/rweb/openapi/index.html

[stale]

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[bowenwang1996]

looks like a duplicate of #1972