Improve code coverage and remove unused modules

[arindas]

• Added tests for single_node router
• Added tests for PartitionConsumer failure paths
• Exclude compat modules and Display impls from code coverage
• Move from BytesCow to Bytes in InMemPartition

[codecov-commenter]

Codecov Report

Base: 68.89% // Head: 80.30% // Increases project coverage by +11.40% 🎉

Coverage data is based on head (f1ae883) compared to base (ea107ca).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #6       +/-   ##
===========================================
+ Coverage   68.89%   80.30%   +11.40%     
===========================================
  Files          21       18        -3     
  Lines         942      858       -84     
===========================================
+ Hits          649      689       +40     
+ Misses        293      169      -124     

Impacted Files	Coverage Δ
src/commit_log/mod.rs	75.00% <ø> (ø)
src/commit_log/segmented_log/mod.rs	79.45% <ø> (+2.38%)	⬆️
src/commit_log/segmented_log/segment.rs	85.55% <ø> (+10.06%)	⬆️
src/common/mod.rs	100.00% <ø> (+38.09%)	⬆️
src/server/glommio_impl/mod.rs	76.92% <ø> (ø)
...erver/glommio_impl/processor/partition_consumer.rs	75.00% <ø> (+13.63%)	⬆️
src/server/glommio_impl/processor/single_node.rs	74.28% <ø> (ø)
src/server/partition/single_node/commit_log.rs	69.76% <ø> (+10.94%)	⬆️
src/server/worker.rs	66.66% <ø> (+19.29%)	⬆️
src/commit_log/glommio_impl/segmented_log/store.rs	77.51% <80.00%> (+0.10%)	⬆️
... and 13 more

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