second persistence model in charge_collection

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• [-] Closes issue #66 - It does not close the issue since there is another more complex model that can be developed.
• Added tests for change code
• Updated documentation for changed code
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The new model uses two maps to work: a trap density map and a trap per unit of full well map. Principle stays the same, memory of the detector stores the trapped charges and they are release on subsequent dark exposure. See pyxel-data/examples/dynamic for an example based on MOONS H4RG ENG grade detector