IDL Bindings - and Protobuf

[steve-hickman-epistimis]

See FACE (not UDDL) spec, Appendix J.8. Part of it applies to UDDL. While IDL specifically is not that high a priority, this gives insight into how UDDL, UDDL Queries, FACE and FACE Templates interact with each other. We should be consistent with this regardless of whether we generate IDL or not.

For basic code gen, search this section for Rule: PlatformIDLType. This has the mapping for UDDL FDTs to IDL FDTs. All code generators should be consistent with this.

IDL spec: https://www.omg.org/spec/IDL/4.2/About-IDL/

NOTE: See also Protobuf spec: https://protobuf.dev/programming-guides/proto3/

Code generators should be consistent across both of these.