Improve GPIO events for ESP32

[AdrianSoundy]

Description

Improves the ESP32 events so that it always toggles between high, low and doesn't fire more than 1 event of same level. This only happened when no de bounce was used.

Another fix was added to not allow a debounceTimeout of less than 10ms as this can cause an internal exception when it tries to create a Freertos timer of 0 ticks

Motivation and Context

The main problem for this issue 630 is a combination of not using debounceTimeout and a previous fix that stopped the input Pull up drive mode working.

• Resolves ESP32 - Gpio repeated behaviour  Home#630

How Has This Been Tested?`

Tested with modified version of sample program with simple reads of value and gpio events.
Checked drive mode pull up working.

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)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)

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.

[nfbot]

Hi @AdrianSoundy,

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

A human will be reviewing it shortly. 😉