Track individual events using Amplitude

[bodom0015]

Description

#132 adds basic required support for Amplitude tracking.

This supplemental PR adds some code to send individual tracking events:

• view_resource: Tracks File/Dataset/Collection Views (includes file/dataset/collection viewed, file/dataset/collection author name/id, viewer name/id, file size)
• extraction: Tracks Extractor Submissions (includes extractor name, target file/dataset, file/dataset author name/id, submitter name/id)
• upload: Tracks File Uploads (includes uploader name/id, target dataset, upload size)

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have signed the CLA
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[lmarini]

Is this still in Draft or ready to be reviewed?