feature/Repeat list heading on new page

[Fernando-hub527]

Description
This feature allows the creation of lists with a fixed header through a method available in the list component. This method receives an instance of Maroto and uses this instance to add the list to the PDF with the fixed header.

Related Issue
#130

Checklist

check with "x", ONLY IF APPLIED to your change

• All methods associated with structs has func (<first letter of struct> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Followed the unit test when,should naming pattern.
• All mocks created with m := mocks.NewConstructor(t).
• All mocks using m.EXPECT().MethodName() method to mock methods.
• Updated docs/doc.go and docs/*
• Updated example_test.go.
• Updated README.md
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.27%. Comparing base (da3191b) to head (232c2f0).
⚠️ Report is 26 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
+ Coverage   87.09%   87.27%   +0.19%     
==========================================
  Files          61       62       +1     
  Lines        2331     2364      +33     
==========================================
+ Hits         2030     2063      +33     
  Misses        268      268              
  Partials       33       33              

Flag	Coverage Δ
unittests	87.27% <100.00%> (+0.19%)	⬆️

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[Fernando-hub527]

@johnfercher conflicts fixed

[maddie]

Will this PR be merged any time soon?

[dennisj86]

Awesome Job! But please, if possible, merge this feature @johnfercher .