Forwardport release-1.2 into master

[Pavinati]

Forwardport changes from releas-1.2 into master. While forwardporting there were 3 things that had to be fixed:

• the CHANGELOG file reported changes of https://github.com/astarte-platform/astarte/pull/973 under [unreleased] from release-1.2
• master required the master version of https://github.com/astarte-platform/astarte_rpc which had to be unlocked from realm management mix.exs file
• revert changes made in release-1.2 that removed -dev from the component version and removing other notices about this being a development release

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.96%. Comparing base (11e9bc6) to head (1d71e47). Report is 34 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1003 +/- ## ========================================== + Coverage 69.40% 69.96% +0.56% ========================================== Files 263 268 +5 Lines 7119 6686 -433 ========================================== - Hits 4941 4678 -263 + Misses 2178 2008 -170 ```

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