feat(apf): add offset to consumer config to modify starting or ending timestamps

[dirodriguezm]

---

Summary of the changes

Closes #290

Observations

Read #290

Components that need updates and steps to follow

To use this in a step, add the offsets["start"] and optionally offsets["end"] to the consumer config

CONSUMER_CONFIG = {
    "PARAMS": {...},
    "offsets": {
        "start": 10,
        "end": 20
    }
}

The timestamps have to be in milliseconds. So datetime.timestamp() objects have to be multiplied by 1000.

About this PR:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (83396af) 74.72% compared to head (2dcb6ac) 76.62%.
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   74.72%   76.62%   +1.89%     
==========================================
  Files          20       12       -8     
  Lines         724      308     -416     
==========================================
- Hits          541      236     -305     
+ Misses        183       72     -111     

Flag	Coverage Δ
unittest	76.62% <ø> (+1.89%)	⬆️

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