GDS does not parse dictionary index field

[thomas-bc]

F´ Version	v3.5.1
Affected Component	GDS/FPP dict

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Problem Description

The FPP dictionary specifies an index (here) for struct members. However the GDS JSON loaders appear to just take the members in order that they are written down, and not look at the specified index.
This needs to be fixed.

Context / Environment

Execute fprime-util version-check and share the output.

Operating System: Darwin
CPU Architecture: x86_64
Platform: macOS-14.7.2-x86_64-i386-64bit
Python version: 3.11.9
CMake version: 3.29.2
Pip version: 23.2.1
Pip packages:
    fprime-tools==3.5.1
    fprime-gds==3.5.2a1
    fprime-fpp-*==2.3.0a1

How to Reproduce

See nasa/fpp#582

[thomas-bc]

Fixes:

• FPP Fix JSON dictionary struct member indexes fpp#588
• GDS Add struct member index parsing to JSON loader fprime-gds#188