refactor: Refactored the type conversion system, introduced type registers and converters

[vistart]

The type conversion system of the database backend was refactored, and the type register (TypeRegistry) and converter (TypeConverter) mechanisms were introduced to replace the original TypeMapper and ValueMapper. This improvement improves the flexibility and scalability of type conversion, and supports more complex type mappings and custom converters. At the same time, the type processing logic of the SQLite backend is optimized to make it more in line with the needs of modern database operations.

[sonarqubecloud]

Quality Gate failed

Failed conditions
7.4% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

Attention: Patch coverage is 67.03448% with 239 lines in your changes missing coverage. Please review.

Project coverage is 75.65%. Comparing base (2419d3b) to head (20eb614).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...ctiverecord/backend/impl/sqlite/type_converters.py	34.89%	87 Missing and 10 partials ⚠️
...ocial/activerecord/backend/basic_type_converter.py	71.73%	49 Missing and 29 partials ⚠️
src/rhosocial/activerecord/backend/base.py	22.50%	31 Missing ⚠️
src/rhosocial/activerecord/backend/dialect.py	85.18%	6 Missing and 6 partials ⚠️
.../rhosocial/activerecord/backend/type_converters.py	86.41%	9 Missing and 2 partials ⚠️
...social/activerecord/backend/impl/sqlite/backend.py	47.36%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   77.03%   75.65%   -1.38%     
==========================================
  Files          42       45       +3     
  Lines        4097     4527     +430     
  Branches      698      812     +114     
==========================================
+ Hits         3156     3425     +269     
- Misses        733      853     +120     
- Partials      208      249      +41     

Flag	Coverage Δ
python-3.10	75.43% <67.03%> (-1.36%)	⬇️
python-3.11	75.43% <67.03%> (-1.36%)	⬇️
python-3.12	75.43% <67.03%> (-1.36%)	⬇️
python-3.13	75.43% <67.03%> (-1.36%)	⬇️
python-3.8	75.57% <67.03%> (-1.37%)	⬇️
python-3.9	75.41% <67.03%> (-1.36%)	⬇️
unittests	75.63% <67.03%> (-1.38%)	⬇️

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