Added label feature for the techui.yaml

[adedamola-sode]

The changes include adding fields labels and child labels to techui.yaml components, which get passed as into the component models and entities. Then from entities, we get generated screens that take into consideration the child labels for the names of the screens, and also the main label instead of a key of components in the yaml file. After the screens are generated, the generate_json_map uses a new function _get_labels to fetch the labels from the techui.yaml, and places them where needed, taking precedence before what is already in the screens.

[codecov]

Codecov Report

❌ Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.76%. Comparing base (28f53e3) to head (f964208).

Files with missing lines	Patch %	Lines
src/techui_builder/builder.py	92.85%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   94.66%   94.76%   +0.09%     
==========================================
  Files          10       10              
  Lines         825      859      +34     
==========================================
+ Hits          781      814      +33     
- Misses         44       45       +1     

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