c8y-mapper: extract operations module

[Bravo555]

Proposed changes

This is a subset of changes in #2311, where operations code in the c8y mapper was extracted into a module. It should have fewer issues so it can be merged faster, so these changes could be more quickly integrated into other PRs.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

#2477

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

Codecov Report

Merging #2517 (e0c1041) into main (751f326) will decrease coverage by 0.5%.
Report is 6 commits behind head on main.
The diff coverage is 68.5%.

Additional details and impacted files

Files	Coverage Δ
crates/extensions/c8y_mapper_ext/src/actor.rs	75.0% <ø> (-3.7%)	⬇️
crates/extensions/c8y_mapper_ext/src/converter.rs	81.3% <100.0%> (-0.1%)	⬇️
crates/extensions/c8y_mapper_ext/src/lib.rs	88.8% <ø> (ø)
...s/c8y_mapper_ext/src/operations/firmware_update.rs	86.9% <ø> (ø)
...nsions/c8y_mapper_ext/src/operations/log_upload.rs	87.9% <100.0%> (ø)
crates/extensions/c8y_mapper_ext/src/tests.rs	91.6% <100.0%> (ø)
crates/extensions/c8y_mapper_ext/src/config.rs	43.3% <0.0%> (ø)
...es/extensions/c8y_mapper_ext/src/operations/mod.rs	86.6% <86.6%> (ø)
...s/c8y_mapper_ext/src/operations/config_snapshot.rs	87.7% <87.7%> (ø)
...ons/c8y_mapper_ext/src/operations/config_update.rs	47.6% <47.6%> (ø)

... and 3 files with indirect coverage changes

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
367	0	3	367	100	48m49.222999999s

[didier-wenzek]

Approved

[rina23q]

LGTM