feat(api)(frontend): source documents from s3 buckets

[mawandm]

This PR introduces ingesting documents from an s3 bucket.

Testing can be done using localstack by;

1. Running docker-compose -f compose-dev.yml up
2. Create a bucket with aws --endpoint-url=http://localhost:4566 s3 mb s3://nesis-test-bucket --region=us-east-1
3. Upload documents with aws --endpoint-url="http://localhost:4566" s3 sync Documents/BBK/ s3://nesis-test-bucket
4. Create a session with NESIS_TOKEN=$(curl -s -X POST -H "Content-Type: application/json" -k http://localhost:6000/v1/sessions -d '{"email":"[email protected]","password":"password"}' | jq -r '.token')
5. Create a datasource with curl -d '{"type": "s3", "name": "boe-cloud-docs", "connection": {"user": "your_username","password": "your_password","endpoint": "http://localhost:4566","dataobjects": "my-test-bucket","region": "us-east-1"}}' -H "Content-Type: application/json" -H "Authorization: Bearer $NESIS_TOKEN" -X POST http://127.0.0.1:6000/v1/datasources
6. Create a task with curl -X POST -H "Content-Type: application/json" -H "Authorization: Bearer $NESIS_TOKEN" -k http://localhost:6000/v1/tasks -d '{"type":"ingest_datasource","parent_uuid":"<datasource-id>", "definition":{"datasource":{"id":"<datasource-id>"}}}', where <datasource-id> is the datasource id from 5.
7. Task created in 6 shoudl start to run

Closes #22

[akizito]

This looks good!