Feature/aw9523 update

[SamAtBackbone]

Description

• Separate constructor from initialization. This way the object can be used before the hardware can be initialized. The object can also be reinitialized later if necessary.
  ⚠️ This is a breaking change. You must call the "initialize()" method after construction for the configuration to take effect!
• Add 'get_output' methods. Allows a read of the set output value.

Motivation and Context

We need to construct the object before the hardware can be initialized. Also, if the AW9523 is shut down and restarted (power rail switching for example) this way it can be reinitialized without deconstructing and reconstructing a new object.
The 'get_output' methods allow to check what the current state of the outputs is in case there is no internal tracking of the state.

How has this been tested?

Used example code to verify the initialization happens as designed.

In this example, the 3V3SW power rail is used to power the AW9523. The 15V enable line is part of the AW9523.
The AW9523 is constructed before the power rails are set. The initialization happens after the "3V3SW Enable" log.
The "port0&1: 255" log is from reading the output registers, showing that the port 0_5 (15V enable line) is high.

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI