[WIP] New API for Vadi

[naipotato]

This PR brings new names for the methods, and fixes a lot a unexpected behaviours. Also documents the library.

Tasks left:

• Fix commit history
• Finish unit tests

With this, #5 is no longer needed

[codecov]

Codecov Report

Merging #9 (4227e52) into main (19e721a) will decrease coverage by 45.00%.
The diff coverage is 55.00%.

@@             Coverage Diff              @@
##              main       #9       +/-   ##
============================================
- Coverage   100.00%   55.00%   -45.00%     
============================================
  Files            2        2               
  Lines           82       60       -22     
============================================
- Hits            82       33       -49     
- Misses           0       27       +27     

Impacted Files	Coverage Δ
lib/vdi-recipe-func-closure.vala	0.00% <0.00%> (ø)
lib/vdi-object-factory.vala	58.92% <58.92%> (ø)

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