feat: add wait option to this.retries for delay between attempts

[mostafaNazari702]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Retry logic should accommodate a timeout between retries #2264
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds the green-lit in #2264 (comment): a wait option on this.retries(n, options) to delay each retry attempt by a fixed number of milliseconds or an ms-shorthand string.

[codecov]

Codecov Report

❌ Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.00%. Comparing base (6695fba) to head (57eb266).

Files with missing lines	Patch %	Lines
lib/test.mjs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5980      +/-   ##
==========================================
+ Coverage   80.89%   81.00%   +0.11%     
==========================================
  Files          64       64              
  Lines        4602     4634      +32     
  Branches      976     1004      +28     
==========================================
+ Hits         3723     3754      +31     
- Misses        879      880       +1     

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