Add StepResources and step replicas in Pipeline

[gabrielmbmb]

Description

This PR adds a new StepResource class that allow defining the resources and replicas required for each Step. It also adds a resources attribute to the Step class, and updates the _run_steps methods to create the number of replicas specified. In addition, the _BatchManager has been updated to handle receiving unsorted batches by its seq_no due to the Step replicas.

[codspeed-hq]

CodSpeed Performance Report

Merging #750 will degrade performances by 13.44%

_{Comparing multiple-workers (fb01893) with develop (63ee8c5)}

Summary

❌ 1 (👁 1) regressions

Benchmarks breakdown

	Benchmark	develop	multiple-workers	Change
👁	test_cache_time	294.3 ms	340 ms	-13.44%