Consolidated DeltaSolver and KeyValueStoreSolver into DefaultSolver

[tombonfert]

Summary

• Consolidated the implementation of DeltaSolver and KeyValueStoreSolver into the new DefaultSolver class
• Replaced instances of DeltaSolver and KeyValueStoreSolver with DefaultSolver across documentation and configuration files to reflect the new unified solver approach.
• Updated the pydoc-markdown configuration to remove deprecated solver references and clarify the usage of DefaultSolver.
• Enhanced the query engine documentation to explain the behavior of DefaultSolver in relation to silver-layer table configurations.
• Removed DeltaSolver API documentation and added DefaultSolver API documentation to ensure consistency and clarity in the codebase.

Changes

Test Plan

• Unit tests added/updated
• Manual testing completed
• Documentation updated (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• No new linter warnings introduced

[codecov]

Codecov Report

❌ Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.88%. Comparing base (fcd65ca) to head (2f6a8db).

Files with missing lines	Patch %	Lines
src/impulse_reporting/core/report.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   86.35%   86.88%   +0.53%     
==========================================
  Files          52       51       -1     
  Lines        4229     4118     -111     
  Branches      507      492      -15     
==========================================
- Hits         3652     3578      -74     
+ Misses        479      448      -31     
+ Partials       98       92       -6     

Files with missing lines	Coverage Δ
...mpulse_query_engine/analyze/query/query_builder.py	87.77% <ø> (ø)
...ery_engine/analyze/query/solvers/default_solver.py	94.26% <100.00%> (ø)
...query_engine/analyze/query/solvers/query_solver.py	87.09% <ø> (ø)
...query_engine/analyze/query/solvers/series_cache.py	80.00% <ø> (ø)
...uery_engine/analyze/query/solvers/solver_config.py	100.00% <ø> (ø)
src/impulse_reporting/config/config_parser.py	97.14% <100.00%> (+0.02%)	⬆️
src/impulse_reporting/core/report.py	89.06% <66.66%> (-0.09%)	⬇️

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