fix: Implement ApiResourceAggregation to deduplicate logic for BackgroundResources.

[dpcollins-google]

No description provided.

[codecov]

Codecov Report

Merging #301 into master will increase coverage by 0.28%.
The diff coverage is 64.00%.

@@             Coverage Diff              @@
##             master     #301      +/-   ##
============================================
+ Coverage     71.01%   71.29%   +0.28%     
+ Complexity      893      892       -1     
============================================
  Files           151      152       +1     
  Lines          4733     4727       -6     
  Branches        235      236       +1     
============================================
+ Hits           3361     3370       +9     
+ Misses         1231     1223       -8     
+ Partials        141      134       -7     

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/google/cloud/pubsublite/AdminClient.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...google/cloud/pubsublite/internal/CursorClient.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...le/cloud/pubsublite/internal/TopicStatsClient.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ud/pubsublite/internal/ApiResourceAggregation.java	40.00% <40.00%> (ø)	3.00 <3.00> (?)
...gle/cloud/pubsublite/internal/AdminClientImpl.java	88.88% <100.00%> (ø)	24.00 <1.00> (ø)
...le/cloud/pubsublite/internal/CursorClientImpl.java	100.00% <100.00%> (+20.93%)	8.00 <1.00> (-2.00)	⬆️
...loud/pubsublite/internal/TopicStatsClientImpl.java	100.00% <100.00%> (+30.00%)	5.00 <2.00> (-2.00)	⬆️
.../google/cloud/pubsublite/PartitionLookupUtils.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...ud/pubsublite/beam/TopicBacklogReaderSettings.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
... and 5 more

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