Add align type Justify to texts

[ArianeASA]

Description

Added the justified alignment type for texts, which aligns the text with the margins.
The new type calculates the size of white space needed to completely fill a line.

Related Issue

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

Attention: Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.

Project coverage is 84.60%. Comparing base (8cc69ea) to head (cbcf3fe).

Files	Patch %	Lines
internal/providers/gofpdf/text.go	0.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #460      +/-   ##
==========================================
- Coverage   85.71%   84.60%   -1.11%     
==========================================
  Files          61       61              
  Lines        2155     2174      +19     
==========================================
- Hits         1847     1839       -8     
- Misses        281      308      +27     
  Partials       27       27              

Flag	Coverage Δ
unittests	84.60% <0.00%> (-1.11%)	⬇️

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[johnfercher]

Awesome contribution, I just added a couple of comments. Could you solve them?

[johnfercher]

If you see the other alignments there are a logic as:

if textProp.Hyperlink != nil {
    s.pdf.LinkString(dx+xColOffset+left, yColOffset+top-fontHeight, textWidth, fontHeight, *textProp.Hyperlink)
    s.pdf.LinkString(dx+xColOffset+left, yColOffset+top-fontHeight, textWidth, fontHeight, *textProp.Hyperlink)
}

This is important to apply a link to text if required, I think that we have to add this here too. Otherwise, we will introduce a bug that links doesn't work with justify.

[ArianeASA]

Thanks for the tip.
I added the hyperlink in the justified text.

[johnfercher]

There are some lint issues pointed out too. About the unit tests you can let without. I'm about to refactor this text component entirely.

[johnfercher]

Awesome work @ArianeASA !