feat: export license texts into specified directory

[wgnf]

📫 Addressed Issue(s)

• Closes #15

📄 Description

Adds the ability to provide a directory to where the extracted license-texts will be exported.

• [x] add new settings
• [x] add new IResultProcessor that will generate the files in the directory
• [x] update documentation + README

✅ Checks

• [x] My PR adheres to the general code-style of this project (look at other code if you're unsure)
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the automated tests have passed

[codecov[bot]]

Codecov Report

Merging #93 (673ce84) into main (0e86c95) will increase coverage by 0.12%. The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   96.45%   96.57%   +0.12%     
==========================================
  Files          52       52              
  Lines        2029     2076      +47     
==========================================
+ Hits         1957     2005      +48     
+ Misses         72       71       -1     

Impacted Files	Coverage Δ
src/Tool/Liz.Tool/CommandLine/CommandProvider.cs	79.50% <72.72%> (-0.14%)	:arrow_down:
...z.Core/Result/ExportLicenseTextsResultProcessor.cs	100.00% <100.00%> (ø)
...Nuke/Liz.Nuke/ExtractLicensesSettingsExtensions.cs	100.00% <100.00%> (ø)
src/Tool/Liz.Tool/CommandLine/CommandRunner.cs	100.00% <100.00%> (ø)
...Core/Liz.Core/Settings/SettingsInvalidException.cs

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