chore(cli): [#2012] show download time per file

[mickvandijke]

Description

Adds the time it took to download each file to the console output of the safe files download command.

e.g.:

Downloading "1KB.bin" from 12c1eb9c985dbd6682c4ec2fe0734419d5b48c025706aafb38a322d657aced1a with batch-size 16
Saved "1KB.bin" at /Users/mick/Downloads/safe_files/1KB.bin
File downloaded in 228 milliseconds

Related Issue

Fixes #2012

Type of Change

Please mark the types of changes made in this pull request.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Other (please describe):

Checklist

Please ensure all of the following tasks have been completed:

• [x] I have read the contributing guidelines.
• [x] I have performed a self-review of my own code.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] New and existing unit tests pass locally with my changes.
• [ ] I have updated the documentation accordingly.
• [ ] I have followed the conventional commits guidelines for commit messages.
• [ ] I have verified my commit messages with commitlint.