Enable header parsing to use R: std::io::BufRead

[str4d]

Part of #368.

[codecov]

Codecov Report

Merging #377 (f337b55) into main (3260c7d) will increase coverage by 0.48%.
The diff coverage is 62.36%.

@@            Coverage Diff             @@
##             main     #377      +/-   ##
==========================================
+ Coverage   39.31%   39.80%   +0.48%     
==========================================
  Files          34       34              
  Lines        3080     3115      +35     
==========================================
+ Hits         1211     1240      +29     
- Misses       1869     1875       +6     

Impacted Files	Coverage Δ
rage/src/bin/rage-mount/main.rs	0.00% <ø> (ø)
rage/src/bin/rage/main.rs	0.00% <ø> (ø)
age/src/primitives/armor.rs	40.86% <50.87%> (+0.55%)	⬆️
age/src/format.rs	48.54% <60.00%> (+1.95%)	⬆️
age/src/protocol.rs	65.24% <85.71%> (+0.91%)	⬆️
age/tests/testkit.rs	88.77% <100.00%> (+1.87%)	⬆️

... and 2 files with indirect coverage changes

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