chore: Added devcontainer for local development

[vqrf]

Changes

Added devcontainer for local development.

Notes

Devcontainer capabilities:

• docker in docker, with moby disabled (not present in debian 13)
• Rust 1.93 with rust-analyzer, rust-src, rustfmt, clippy, rust-docs
• protobuf installed

Justification

Use new popular way to develop code with easy and reproducible environment for everyone.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (09b85b5) to head (31c9bbc).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3383   +/-   ##
=====================================
  Coverage   82.2%   82.2%           
=====================================
  Files        128     128           
  Lines      24626   24626           
=====================================
  Hits       20267   20267           
  Misses      4359    4359           

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