Chirp stack update

[chicco785]

Proposed changes

This PR completed the update from LoraServer.io to ChirpStack:

• change the provider id to support chirpstack
• rename files to refer to chirpstack Additionally:
• simplify set-up of local dev environment providing a docker compose

Types of changes

What types of changes does your code introduce to the project: Put an x in the boxes that apply

• [ ] Bugfix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [X] I have read the CONTRIBUTING doc
• [X] I have signed the Contributor License Agreement
• [X] I have updated the CHANGE LOG
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

N/A

"IoT Agent LoRaWAN Entity Contributor License Agreement"

"Contributing to IoT Agent LoRaWAN"

"IoT Agent LoRaWAN Change Log"

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[chicco785]

this pr should be rebased and merged on top of #143 , once #143 is merged

[chicco785]

fixes #136

[chicco785]

fixes #121 (docker images are now build using node v12)