Fix BatteryElectrochemEODEOL model

[lymichelle21]

Address #199 with [Option 3] by reworking the combined BatteryElectroChemEODEOL model so that the relevant parameters do not change inside the model and instead stay as states. This prevents the overriding behavior with qMobile, tDiffusion, and Ro in the original implementation. The parameters affected by side effects are now handled locally in their respective functions.

This way, we can still use LazySim so event_state can be calculated only as needed without intermediate printing. This option is less memory intensive than [Option 1] and less computationally expensive than [Option 2]. The main downside is some instances of duplicated code. There is some refactoring introduced to help mitigate this.

[TODO]: Add tests, update documentation, clean code and move test notebooks

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