Add hooks, error handling, restructure and condense code

[evanjt]

Major cleanup reducing original codebase size by almost half while adding a modular hook system for better customisation in handler function overrides, error handling with ApiError with some security hardening.

Highlights

• Hook system: #[crudcrate(create::one::pre = validate_fn)] syntax for lifecycle hooks
• Batch operations: create_many and update_many with hook support
• ApiError: Consistent error handling, allowing internal stdout trace logging for internal errors by default (impl From on DbErr), but customisability to allow custom client api-side error messages with status codes if needed (while maintaining separate message for internal logging). Fixes issue Improve error handling #3
• Security: SQL injection fixes, pagination limits, input sanitisation

Removed

• index_analysis module (use database-native tools instead)
• Dead code: attributes.rs, join_strategies/, redundant examples

Breaking Changes

• register_crud_analyser! macro removed
• analyse_and_display_indexes() method removed from trait

See CHANGELOG.md for full details.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.58010% with 422 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.89%. Comparing base (9625474) to head (049bc56).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crudcrate/src/operations.rs	0.00%	65 Missing ⚠️
crudcrate-derive/src/codegen/joins/loading.rs	60.60%	39 Missing ⚠️
crudcrate-derive/src/fields/extraction.rs	63.41%	30 Missing ⚠️
crudcrate-derive/src/attribute_parser.rs	91.08%	27 Missing ⚠️
crudcrate-derive/src/codegen/models/shared.rs	81.69%	26 Missing ⚠️
crudcrate-derive/src/lib.rs	71.42%	24 Missing ⚠️
crudcrate/src/validation.rs	84.05%	22 Missing ⚠️
crudcrate-derive/src/fields/analysis.rs	72.97%	20 Missing ⚠️
crudcrate/src/filtering/conditions.rs	89.83%	18 Missing ⚠️
crudcrate/src/core/traits.rs	0.00%	16 Missing ⚠️
... and 19 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #5       +/-   ##
===========================================
+ Coverage   62.22%   79.89%   +17.67%     
===========================================
  Files          25       34        +9     
  Lines        3031     3358      +327     
===========================================
+ Hits         1886     2683      +797     
+ Misses       1145      675      -470     

Flag	Coverage Δ
unittests	79.89% <81.58%> (+17.67%)	⬆️

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