feat: Implement RetryScheduler utility

[FrogTheFrog]

Description

Added utility for... you guessed it! Retrying stuff until it succeeds! (to be used in Sunshine)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

Attention: Patch coverage is 96.10390% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.64%. Comparing base (51b7430) to head (9235be4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   93.54%   93.64%   +0.10%     
==========================================
  Files          34       36       +2     
  Lines        1734     1811      +77     
  Branches      973     1014      +41     
==========================================
+ Hits         1622     1696      +74     
- Misses         54       61       +7     
+ Partials       58       54       -4     

Flag	Coverage Δ
Linux	90.26% <95.83%> (+2.05%)	⬆️
Windows	93.60% <95.77%> (+0.09%)	⬆️
macOS	64.43% <63.51%> (-0.33%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/common/retryscheduler.cpp	100.00% <100.00%> (ø)
src/common/include/displaydevice/retryscheduler.h	95.58% <95.58%> (ø)

... and 1 file with indirect coverage changes

[FrogTheFrog]

I'm fine with the coverage, only 3 BS lines remaining...