astarte_data_access_generators to mono-repo

[shinnokdisengir]

What this PR does / why we need it:

Additional documentation e.g. usage docs, diagrams, reviewer notes, etc.:

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.50%. Comparing base (c77def9) to head (5480e38).

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.3    #1922      +/-   ##
===============================================
+ Coverage        85.44%   85.50%   +0.05%     
===============================================
  Files              589      591       +2     
  Lines            10260    10272      +12     
===============================================
+ Hits              8767     8783      +16     
+ Misses            1493     1489       -4     

Files with missing lines	Coverage Δ
...bs/astarte_data_access_generators/lib/interface.ex	100.00% <100.00%> (ø)
libs/astarte_data_access_generators/lib/mapping.ex	100.00% <100.00%> (ø)

... and 8 files with indirect coverage changes

Flag	Coverage Δ
astarte_appengine_api	86.55% <ø> (+0.10%)	⬆️
astarte_data_access	82.35% <ø> (ø)
astarte_data_access_generators	100.00% <100.00%> (?)
astarte_data_updater_plant	81.65% <ø> (+0.11%)	⬆️
astarte_events	79.40% <ø> (ø)
astarte_generators	97.56% <ø> (-0.18%)	⬇️
astarte_housekeeping	85.83% <ø> (-0.15%)	⬇️
astarte_pairing	84.01% <ø> (-0.06%)	⬇️
astarte_realm_management	88.62% <ø> (+0.22%)	⬆️
astarte_rpc	88.23% <ø> (ø)
astarte_trigger_engine	82.52% <ø> (ø)

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