Rework SerialDevice watcher

[josesimoes]

Description

• Remove event handler for SerialDevice.
• Add SerialDeviceManager to decouple the device watcher from the actual SerialDevice.
• Rework code to have an individual SerialDevice for each connected device instead of reusing the watcher "current device".
• Rework nano device detection algorithm.
• Rework workflow of new device added and enumeration completed.
• Rename Parent to ConnectedPort on nano device for clarity.

*** USB device hasn't been reworked ***

Motivation and Context

• Improve device detection, removal and adding.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• 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 change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: José Simões jose.simoes@eclo.solutions

[nfbot]

Hi @josesimoes,

I'm nanoFramework bot.
Thank you for your contribution!

A human will be reviewing it shortly. 😉

[josesimoes]

SonarCloud failing on low code coverage. Ignoring.