chore(dup): add MQTT control/keyAgreement topic for Encrypted Endpoints

[mizzet1]

This PR aims to add the MQTT control/keyAgreement topic for the Encrypted Endpoints feature, in particular for the handshake between Astarte and Devices to exchange messages

[codecov]

Codecov Report

❌ Patch coverage is 75.60976% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.64%. Comparing base (7db95a9) to head (040695d).
⚠️ Report is 3825 commits behind head on master.

Files with missing lines	Patch %	Lines
...rte_secrets/lib/astarte_secrets/astarte_secrets.ex	58.33%	5 Missing ⚠️
...rte_secrets/test/support/helpers/encryption_key.ex	57.14%	3 Missing ⚠️
libs/astarte_secrets/lib/astarte_secrets/core.ex	88.23%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1994       +/-   ##
===========================================
+ Coverage   67.67%   86.64%   +18.96%     
===========================================
  Files         264      679      +415     
  Lines        6456    12014     +5558     
===========================================
+ Hits         4369    10409     +6040     
+ Misses       2087     1605      -482     

Files with missing lines	Coverage Δ
...updater_plant/data_updater/core/control_handler.ex	88.88% <100.00%> (ø)
libs/astarte_secrets/lib/astarte_secrets/core.ex	91.45% <88.23%> (ø)
...rte_secrets/test/support/helpers/encryption_key.ex	57.14% <57.14%> (ø)
...rte_secrets/lib/astarte_secrets/astarte_secrets.ex	71.79% <58.33%> (ø)

... and 561 files with indirect coverage changes

Flag	Coverage Δ
astarte_adapters	100.00% <ø> (?)
astarte_appengine_api	86.46% <ø> (+3.98%)	⬆️
astarte_data_access	84.97% <ø> (?)
astarte_data_access_generators	100.00% <ø> (?)
astarte_data_updater_plant	87.06% <100.00%> (+23.06%)	⬆️
astarte_events	80.27% <ø> (?)
astarte_fdo	81.53% <ø> (?)
astarte_fdo_core	77.99% <ø> (?)
astarte_generators	97.56% <ø> (?)
astarte_housekeeping	86.26% <ø> (+38.42%)	⬆️
astarte_realm_management	88.64% <ø> (+22.33%)	⬆️
astarte_rpc	88.23% <ø> (?)
astarte_secrets	86.13% <72.22%> (?)
astarte_test_suite	100.00% <ø> (?)
astarte_trigger_engine	82.67% <ø> (+38.69%)	⬆️

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