Add option for smaller dataset in IO notebook

[charlesbluca]

Adds the option to use a smaller ~300MB SigMF dataset for the IO examples, as well as code to automatically download / extract the dataset of choice.

Note that there are some failures in the notebook - raised #474 to cover this.

Closes https://github.com/rapidsai/cusignal/issues/472

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[charlesbluca]

@awthomp is this good to merge or would you like additional changes?

[awthomp]

@charlesbluca LGTM

[charlesbluca]

Ah I just noticed that I should rerun the cells with ValueErrors now that the pinned buffer issues have been resolved - will do that then this should be good to merge

[charlesbluca]

Sorry for the delay - this should be good to merge now

[github-actions[bot]]

This PR has been labeled inactive-30d due to no recent activity in the past 30 days. Please close this PR if it is no longer required. Otherwise, please respond with a comment indicating any updates. This PR will be labeled inactive-90d if there is no activity in the next 60 days.

[awthomp]

@gpucibot merge