features/Doc processor

[Fernando-hub527]

Description

This feature enables the generation of PDFs from serialized documents. To achieve this, the PDF template creation process is decoupled from the document generation, as outlined in RFC.

Related Issue

#390

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 72.29465% with 425 lines in your changes missing coverage. Please review.

Project coverage is 81.73%. Comparing base (6923857) to head (7d8c3c8).

Files with missing lines	Patch %	Lines
pkg/processor/mappers/propsmapper/consts.go	0.00%	56 Missing ⚠️
pkg/processor/processorprovider/Maroto.go	76.48%	24 Missing and 12 partials ⚠️
pkg/processor/mappers/components/rowmapper/row.go	74.73%	19 Missing and 4 partials ⚠️
pkg/processor/mappers/propsmapper/text.go	0.00%	19 Missing ⚠️
pkg/processor/mappers/documentmapper/document.go	86.37%	10 Missing and 8 partials ⚠️
pkg/processor/mappers/propsmapper/metadata.go	0.00%	18 Missing ⚠️
pkg/processor/mappers/propsmapper/customfont.go	0.00%	17 Missing ⚠️
pkg/processor/mappers/propsmapper/font.go	0.00%	17 Missing ⚠️
pkg/processor/mappers/propsmapper/signature.go	0.00%	14 Missing ⚠️
pkg/processor/loader/loader.go	74.47%	6 Missing and 6 partials ⚠️
... and 23 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #504      +/-   ##
==========================================
- Coverage   87.94%   81.73%   -6.21%     
==========================================
  Files          61       96      +35     
  Lines        2330     3864    +1534     
==========================================
+ Hits         2049     3158    +1109     
- Misses        246      609     +363     
- Partials       35       97      +62     

Flag	Coverage Δ
unittests	81.73% <72.30%> (-6.21%)	⬇️

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[Fernando-hub527]

I've marked this PR as a draft since I still need to work on the documentation and add more tests. I'd also appreciate any feedback on the feature.