feat: Add new method IsBlock::declared_style

[scouten]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 9.41%. Comparing base (b013c57) to head (cebcb87).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #179      +/-   ##
========================================
+ Coverage   9.38%   9.41%   +0.02%     
========================================
  Files        324     324              
  Lines      19830   19835       +5     
========================================
+ Hits        1862    1867       +5     
  Misses     17968   17968              

Components	Coverage Δ
Parser test coverage	100.00% <100.00%> (ø)
AsciiDoc spec coverage	1.48% <ø> (ø)

[codspeed-hq]

CodSpeed Performance Report

Merging #179 will not alter performance

_{Comparing is-block+declared-style (cebcb87) with main (b013c57)}

Summary

✅ 4 untouched benchmarks