Initial DevContainer setup

[mikehaller]

A DevContainer which shows how to set up the Rust compiler and tools to make the databroker build work in vscode out of the box.

I know devcontainers are subjective and some project members may not be in favour of such a "proprietary" setup. But it will help the adoption for developers in a corporate environment :-P

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.17%. Comparing base (86ed421) to head (e0a3f3d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
+ Coverage   60.15%   60.17%   +0.02%     
==========================================
  Files          33       33              
  Lines       16191    16177      -14     
==========================================
- Hits         9739     9734       -5     
+ Misses       6452     6443       -9     

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[SebastianSchildt]

@mikehaller Attention if you keep working on this locally, I did a rebase, becasue I assume the linter errors might have been due to recently merged #129