feat(ingestion): Implement DB migrations & Ingestion IAC

[hibare]

This PR introduces several key enhancements to our project:

1. Database Migration using Alembic: Implements a new database migration to modify the schema and ensure compatibility with new data ingestion requirements.
   • Added new Alembic migration scripts located in the migrations/db/versions directory for findings, scans and jobs table.
   • The migration script alters the database schema to include new tables and columns required for the ingestion process.
2. Infrastructure as Code (IAC) for Data Ingestion: Sets up the infrastructure to handle data ingestion using AWS services.
   • Added Terraform configuration files in the infrastructure/ingestion/aws directory.
   • The configuration provisions necessary AWS resources, step function, Lambda functions, and IAM roles.
3. Lambda Functions for Data Ingestion: Includes Lambda functions to ingest data from S3 into the database tables.
   • Implemented Lambda functions in the infrastructure/ingestion/aws/lambda directory.
   • They process incoming data files and insert the data into the appropriate database tables.
4. Ingestions: Implement findings data ingestion.

[yilmi]

lgtm