`FrameInfo` builder

[CosmicHorrorDev]

This adds in fluent API style contruction for FrameInfo. Now you can do

let info = FrameInfo::new()
    .block_size(BlockSize::Max1MB)
    .content_checksum(true);

IMO it reads better, but it also has the benefit of making it easier to see when the returned FrameInfo is unused through avoiding mutability. E.g this wouldn't get picked up as unused

let mut info = FrameInfo::new();
info.content_checksum = true;

[codecov[bot]]

Codecov Report

Merging #99 (a8baba2) into main (be2ea76) will decrease coverage by 0.99%. The diff coverage is 11.53%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   89.39%   88.41%   -0.99%     
==========================================
  Files          11       11              
  Lines        2179     2192      +13     
==========================================
- Hits         1948     1938      -10     
- Misses        231      254      +23     

Impacted Files	Coverage Δ
src/frame/header.rs	79.74% <11.53%> (-9.10%)	:arrow_down:

... and 1 file with indirect coverage changes

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[PSeitz]

Thanks!