Add lines key to v1 source coverage JSON

[ranweiler]

• Mirror binary format by adding a lines subkey, enabling easier file metadata
• Serialize line numbers as decimal strings
• Integration test source coverage conversions

[codecov-commenter]

Codecov Report

Merging #2718 (9bda942) into main (4dbc9c0) will increase coverage by 1.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #2718      +/-   ##
==========================================
+ Coverage   28.55%   29.62%   +1.06%     
==========================================
  Files         320      284      -36     
  Lines       38108    31877    -6231     
==========================================
- Hits        10881     9442    -1439     
+ Misses      27227    22435    -4792     

Impacted Files	Coverage Δ
...gent/onefuzz-file-format/src/coverage/source/v1.rs	75.86% <63.15%> (+75.86%)	⬆️
src/agent/coverage/src/source.rs	9.57% <100.00%> (+9.57%)	⬆️
src/agent/onefuzz/src/machine_id.rs	11.53% <0.00%> (-8.98%)	⬇️
src/agent/coverage-legacy/src/test.rs	92.85% <0.00%> (-7.15%)	⬇️
src/agent/onefuzz/src/sanitizer.rs	68.65% <0.00%> (-2.97%)	⬇️
src/agent/onefuzz-agent/src/worker/tests.rs	99.10% <0.00%> (-0.11%)	⬇️
src/agent/onefuzz/src/asan.rs	0.00% <0.00%> (ø)
src/agent/coverage/src/record.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/setup.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/reboot.rs	0.00% <0.00%> (ø)
... and 54 more

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