Reimplement size-based filters using FeroxFilter trait

[epi052]

Landing a Pull Request (PR)

Long form explanations of most of the items below can be found in the CONTRIBUTING guide.

Branching checklist

• There is an issue associated with your PR (bug, feature, etc.. if not, create one)
• Your PR description references the associated issue (i.e. fixes [FEATURE REQUEST] Dynamically tuning concurrency/connection limit or bailing after n connection failures #123)
• Code is in its own branch
• Branch name is related to the PR contents
• PR targets master

Static analysis checks

• All rust files are formatted using cargo fmt
• All clippy checks pass when running cargo clippy --all-targets --all-features -- -D warnings -A clippy::unnecessary_unwrap
• All existing tests pass

Documentation

• New code is documented using doc comments
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Additional Tests

• New code is unit tested
• New code is integration tested, as needed
• New tests pass

[codecov]

Codecov Report

Merging #132 (b1b9ea7) into master (db88e16) will increase coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   94.25%   94.64%   +0.38%     
==========================================
  Files          12       12              
  Lines        1951     2036      +85     
==========================================
+ Hits         1839     1927      +88     
+ Misses        112      109       -3     

Impacted Files	Coverage Δ
src/filters.rs	94.64% <100.00%> (+13.01%)	⬆️
src/main.rs	90.74% <100.00%> (+0.48%)	⬆️
src/scanner.rs	93.31% <100.00%> (+0.21%)	⬆️

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