feat: Adding ability to create a subscription at HEAD

[hannahrogers-google]

No description provided.

[codecov]

Codecov Report

Merging #545 (02cb149) into master (39e04e4) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #545      +/-   ##
============================================
- Coverage     72.70%   72.66%   -0.04%     
- Complexity      860      861       +1     
============================================
  Files           156      156              
  Lines          4477     4482       +5     
  Branches        210      211       +1     
============================================
+ Hits           3255     3257       +2     
- Misses         1102     1104       +2     
- Partials        120      121       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/google/cloud/pubsublite/AdminClient.java	80.00% <100.00%> (+80.00%)	1.00 <1.00> (+1.00)
...gle/cloud/pubsublite/internal/AdminClientImpl.java	100.00% <100.00%> (ø)	19.00 <0.00> (+1.00)
...ubsublite/internal/BlockingPullSubscriberImpl.java	87.93% <0.00%> (-5.18%)	11.00% <0.00%> (-1.00%)

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[dpcollins-google]

LGTM after fixes. Ping me once fixed

[dpcollins-google]

default ApiFuture<Subscription> createSubscription(Subscription subscription) { createSubscription(subscription, OffsetLocation.END); }

[dpcollins-google]

Also modify the comment to make it clear where this creates the subscription

[hannahrogers-google]

Done. This is ready for another look. Thanks!