Small stream improvements

[Schamper]

Looks like #31 may not work out (or at least needs a lot more investigation), but we can take some of the small stream improvements from that branch and put them in main. Mostly stylistic things such as improved docstrings and a simplified RelativeStream/RangeStream.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (213256e) to head (f70351e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/util/stream.py	0.00%	39 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #88   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         22      22           
  Lines       1367    1364    -3     
=====================================
+ Misses      1367    1364    -3     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #88 will not alter performance

_{Comparing small-stream-improvements (f70351e) with main (213256e)}

Summary

✅ 13 untouched