Reduce timer cpu load

[0xFirekeeper]

While still avoiding task.delay / system threading timer

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PR-Codex overview

This PR improves the Delay method in the ThirdwebTask class by optimizing the delay mechanism to reduce CPU usage and enhance responsiveness during the wait period.

Detailed summary

• Changed the while condition in Delay to use a calculated endTime.
• Introduced a currentDelay variable to dynamically adjust delay duration.
• Modified MinimalDelay to use Stopwatch for accurate timing.
• Reduced CPU usage by incorporating Thread.Sleep(1) in MinimalDelay.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.63%. Comparing base (7e8493a) to head (ea44643).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   86.60%   86.63%   +0.03%     
==========================================
  Files          26       26              
  Lines        3726     3735       +9     
  Branches      513      513              
==========================================
+ Hits         3227     3236       +9     
  Misses        499      499              

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