Upgrade dotnet versions

[Mandur]

• Upgrade .net 2.2 to 3.1
• Upgrade function runtime to ~3
• Use standard Arduino library for the CI

[TechPreacher]

Should we also update the .NET and dependencies versions in the \Samples and \Tools project folder?

[Mandur]

Thanks for the suggestion @TechPreacher that sound like a lovely idea!

[Mandur]

https://dev.azure.com/epicstuff/Azure%20IoT%20Edge%20LoRaWAN%20Starter%20Kit/_build/results?buildId=24621&view=logs&j=7826f347-8899-53d0-eafc-d3fbcaf988d6&t=b3b7d5bb-2197-57f0-8944-1e6878e9d878 All test worked except OTAAJoinTest

[TechPreacher]

Thanks for the suggestion @TechPreacher that sound like a lovely idea!

I'm happy to take this if you are short on time.

[Mandur]

That would be great, Do you include it in another PR then?
OTAAJoinTest passed https://dev.azure.com/epicstuff/Azure%20IoT%20Edge%20LoRaWAN%20Starter%20Kit/_build/results?buildId=24622&view=logs&j=7826f347-8899-53d0-eafc-d3fbcaf988d6&t=7826f347-8899-53d0-eafc-d3fbcaf988d6

[fbeltrao]

Had a few suggestions. One thing we could think about is moving all the common used variables (target framework, unit test versions, etc) into a props file and reference it everywhere. This way modifying the used version is done in a single place and applied to all projects.