add basic INA228 support

[sanchox]

Description

INA228 support

Fixes #77

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Some tests with two INA228 on custom HW using modified DisplayReadings.ino example and custom code with

INA.getBusMilliVolts()
INA.getBusMicroAmps()
INA.getBusMicroWatts()

Test Configuration:

• Arduino version: ???
• Arduino Hardware: AZ-Delivery ESP-32 Dev Kit C V4
• SDK: VSCode + PlatformIO + framework-arduinoespressif32 @ 3.20005.220925 (2.0.5) + Wire @ 2.0.0
• Development system: Ubuntu 20.04

Checklist:

• The changes made link back to an existing issue number
• I have performed a self-review of my own code
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• The code adheres to the Google Style Guide
• The code follows the existing program documentation style using doxygen
• I have made corresponding changes to the documentation / Wiki Page(s)
• My changes generate no new warnings
• The automated TRAVIS-CI run has a status of "passed"
• I have checked potential areas where regression errors could occur and have found no issues
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes