Upload unit test data in HiPSCat format

[camposandro]

Upload unit test data (the galaxy and random samples of gundam) in HiPSCat format.

It also adds a requirements.txt file so that we can install LSDB and gundam from source in our pipelines.

• My PR includes a link to the issue that I am addressing

Code Quality

• I have read the Contribution Guide
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[github-actions]

Before [2ad9775]	After [ee74632]	Ratio	Benchmark (Parameter)
3.43±1s	3.91±0.9s	~1.14	benchmarks.time_computation
2.43k	336	0.14	benchmarks.mem_list

Click here to view all benchmarks.

[codecov-commenter]

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