Add the tool data_product_writer with unit test.

[garthwatney]

Related Issue(s)
Has Unit Tests (y/n)
Documentation Included (y/n)

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Change Description

Added the Data Product writer tool which reads a data product binary file and deserializes the data into a JSON output file.
The binary file may contain 1 or more Records which are specified in the FPP.
A unit test is also added which reads in a collection of binary files and produces the resultant JSON data.
The unit test includes a JSON Dictionary which is a manual translation of the DpTool component's FPP.
By running the DpTool component's unit test will generate a collection of binary files. DpTool and its unit test are in the F prime repo under FpTools/dpTool
In addition another JSON file is part of the tool which encapsulates the specification of the data product header information.

Rationale

A tool to deserialize and display F prime data products.

Testing/Review Recommendations

The data_product_writer.py is located in src/fprime_gds/executables
The unit test is located in test/fprime_gds/executables
Run test_data_product_writer.py. The tool will be invoked for each *.bin file in this directory. All the JSON output is placed in JSONoutput

Future Work

Once the F prime JSON dictionary is part of the build, the tool will need to be changed to access this file.

[Joshua-Anderson]

Often times data products wind up storing opaque binary data - it might be nice to provide a mode that decodes the DP header/metadata to a json file but stores the contents of the dp as a binary data instead.

[thomas-bc]

Since I was in there already, I made the few changes that make your test cases runnable in CI and with pytest, I hope you don't mind.

A few comments below:

[thomas-bc]

The code looks good to me! Question about the dictionary, and one comment about reusability.

[thomas-bc]

LGTM!