refactor: extract header, table, tr logic to helper

[adhocore]

Introduction

This is a

• New feature
• Fix for ...
• General improvement
• Backward incompatible change

It closes #

Describe the change

Internal refactor

[codecov-io]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #15   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity      111    117    +6     
=======================================
  Files             4      4           
  Lines           233    248   +15     
=======================================
+ Hits            233    248   +15

Impacted Files	Coverage Δ	Complexity Δ
src/BlockElementParser.php	100% <100%> (ø)	49 <0> (-10)	⬇️
src/HtmlHelper.php	100% <100%> (ø)	17 <16> (+16)	⬆️

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