feat: add doppler stack

[FabrizioCafolla]

Description of your changes

Add doppler integration stack

Related issues, RFCs

Issue number:

Checklist

• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics