rewindablereader: allow to set max size (bluenviron/mediamtx#4791)

[aler9]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.13%. Comparing base (367141b) to head (19e201f).

Files with missing lines	Patch %	Lines
pkg/rewindablereader/reader.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #305   +/-   ##
=======================================
  Coverage   86.12%   86.13%           
=======================================
  Files          92       92           
  Lines        5880     5884    +4     
=======================================
+ Hits         5064     5068    +4     
  Misses        558      558           
  Partials      258      258           

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