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 60.14%. Comparing base (bd6290a) to head (42c0cd6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
+ Coverage   60.11%   60.14%   +0.03%     
==========================================
  Files          33       33              
  Lines       16191    16191              
==========================================
+ Hits         9733     9738       +5     
+ Misses       6458     6453       -5     

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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

[SebastianSchildt]

Looking good to me, just not sure we should pdate Cargo.lock in here (this PR has changed nothing in Cargo, but changing it here, might be some rebasing trouble for the next PR actually needs to change it, like probably #119 ). Opinion @lukasmittag ?

[SebastianSchildt]

Looks good to me, shouldn't break any existing functionality. If CI agrees let's merge 🍏

[lukasmittag]

LGTM!