feat: Add nextOffset method to BufferingPullSubscriber

[dpcollins-google]

feat: Add nextOffset method to BufferingPullSubscriber

[codecov]

Codecov Report

Merging #272 into master will decrease coverage by 0.63%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #272      +/-   ##
============================================
- Coverage     72.43%   71.80%   -0.64%     
- Complexity      771      776       +5     
============================================
  Files           140      141       +1     
  Lines          4096     4146      +50     
  Branches        215      214       -1     
============================================
+ Hits           2967     2977      +10     
- Misses         1004     1044      +40     
  Partials        125      125              

Impacted Files	Coverage Δ	Complexity Δ
...d/pubsublite/internal/BufferingPullSubscriber.java	85.71% <100.00%> (+3.66%)	8.00 <7.00> (+4.00)
...ogle/cloud/pubsublite/internal/FakeApiService.java
...ud/pubsublite/internal/testing/FakeApiService.java	100.00% <0.00%> (ø)	4.00% <0.00%> (?%)
.../pubsublite/internal/testing/UnitTestExamples.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)

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