feat: Add NestJS ClassSerializerInterceptor integration

[Isqanderm]

Purpose

Implement a drop-in replacement for @nestjs/common's ClassSerializerInterceptor that uses om-data-mapper instead of class-transformer for object serialization.

Benefits

• 17.28x faster serialization performance compared to class-transformer
• Zero-config drop-in replacement for existing NestJS applications
• Full compatibility with existing @Expose, @Exclude, @Type, and @Transform decorators
• Leverages existing class-transformer compatibility layer in src/compat/class-transformer/

Scope

• Create new directory: src/integrations/nestjs/
• Implement ClassSerializerInterceptor as a thin wrapper over existing classToPlain function
• Support all NestJS serialization options and decorators
• Ensure tree-shaking works correctly (NestJS code should not be bundled if not used)
• Add comprehensive tests
• Update documentation with migration guide and usage examples

API Compatibility

Should work as a drop-in replacement - users only need to change the import path:

• FROM: import { ClassSerializerInterceptor } from '@nestjs/common';
• TO: import { ClassSerializerInterceptor } from 'om-data-mapper/nestjs';

References

• NestJS Serialization Documentation: https://docs.nestjs.com/techniques/serialization
• Existing class-transformer compatibility layer: src/compat/class-transformer/