Resolve "Stuck Loop needs to pick file based on stuck chunk weighting"

MERGE REQUEST

Overview

This MR aims to select a stuck file with the same stuck chunk based randomness as stuck directories are selected.

Changes to Work Flow

Originally we would select a stuck file randomly based on the number of stuck files in a directory. Now we consider the number of stuck chunks in each file as we randomly select a stuck file.

Testing Changes

Unit test added TestRandomStuckFile

Documentation Changes

Renter README is currently in progress and contains information on how the stuck loop selects chunks. Code comments and docstrings have been updated.

Modules and Packages Impacted

• modules/renter

Example for Visual changes (ie Screenshot)

N/A

Issues Closed

Closes #3559 (closed)

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• Pipeline Passing N/A not fixing an NDF
• All new methods, or updating methods have clear docstrings
• Testing added or updated for new methods
• API documentation updated for API updates N/A not impacting API
• Module README.md updated for changes to work flow