Extend template transformer with shared templates and macros

[akirill0v]

✓ Checklist:

• This PR has been added to CHANGELOG.md (at the top of the list);
• Tests for the changes have been added (for bug fixes / features);
• Docs have been added / updated (for bug fixes / features).

[codecov-commenter]

Codecov Report

Merging #122 (0a37319) into main (03c7857) will increase coverage by 0.07%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   79.18%   79.26%   +0.07%     
==========================================
  Files          50       51       +1     
  Lines        3060     3120      +60     
==========================================
+ Hits         2423     2473      +50     
- Misses        637      647      +10     

Impacted Files	Coverage Δ
datanymizer_engine/src/settings/templates.rs	93.33% <93.33%> (ø)
...atanymizer_engine/src/transformers/template/mod.rs	96.90% <93.75%> (-0.47%)	⬇️
datanymizer_engine/src/settings/mod.rs	81.19% <94.11%> (+1.98%)	⬆️
datanymizer_engine/src/transformer/mod.rs	52.08% <100.00%> (+0.97%)	⬆️
...anymizer_engine/src/transformers/internet/email.rs	90.32% <100.00%> (+0.07%)	⬆️
...mizer_engine/src/transformers/phone/transformer.rs	71.69% <0.00%> (-9.44%)	⬇️

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