fix(): resolve epic games multi-save

[phobos665]

Description

Change to ensure that we can support games that have many saves.
This is a bugfix for games that tend to have very large amount of save files, where it'd break both download & upload of these saves.

Changes:

1. Grab the manifest to list the files
2. Package and chunk the save files
3. Download in parallel to speed up download

Added tests too.

Recording

Type of Change

• Bug fix
• Performance / stability improvement
• Compatibility improvements
• Other (requires prior approval)

Checklist

• If I have access to #code-changes, I have discussed this change there and it has been green-lighted. If I do not have access, I have still provided clear context in this PR. If I skip both, I accept that this change may face delays in review, may not be reviewed at all, or may be closed.
• This change aligns with the current project scope (core functionality, stability, or performance). If not, it has been explicitly approved beforehand.
• I have attached a recording of the change.
• I have read and agree to the contribution guidelines in CONTRIBUTING.md.

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Summary by cubic

Fixes Epic cloud saves for save-heavy games by bypassing the 1000-item metadata cap and downloading chunk files in parallel with retries. Restores reliable uploads/downloads and speeds up downloads.

• Bug Fixes
  • Request chunk read links explicitly via POST using ChunkInfo.getPath(), avoiding the 1000-item listing cap.
  • List manifests only, then fetch chunk links separately to ensure all chunks are reachable.
  • Download chunks in parallel (up to 16) with per-chunk retry and small backoff; reconstruct only needed files.
  • Add tests to ensure ChunkInfo.getPath() is stable across serialize/parse and unique across many chunks.

^{Written for commit 2f7fd13. Summary will update on new commits.}

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[phobos665]

Currently in review as I'm still testing it.