fix: retry streaming subscriber connections on unknown

[hannahrogers-google]

When a streaming subscriber connection is terminated due to an UNKNOWN error, we will now try re-establishing that connection.

[codecov]

Codecov Report

Merging #92 into master will increase coverage by 0.93%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #92      +/-   ##
============================================
+ Coverage     78.94%   79.88%   +0.93%     
- Complexity      293      305      +12     
============================================
  Files            21       21              
  Lines          2598     2600       +2     
  Branches        129      129              
============================================
+ Hits           2051     2077      +26     
+ Misses          492      467      -25     
- Partials         55       56       +1

Impacted Files	Coverage Δ	Complexity Δ
...le/cloud/pubsub/v1/stub/PublisherStubSettings.java	83.8% <ø> (ø)	19 <0> (ø)	⬇️
...com/google/cloud/pubsub/v1/TopicAdminSettings.java	21.27% <ø> (ø)	5 <0> (ø)	⬇️
...in/java/com/google/cloud/pubsub/v1/StatusUtil.java	71.42% <ø> (ø)	4 <0> (ø)	⬇️
...e/cloud/pubsub/v1/stub/SubscriberStubSettings.java	85.05% <ø> (ø)	27 <0> (ø)	⬇️
...gle/cloud/pubsub/v1/SubscriptionAdminSettings.java	14.28% <ø> (ø)	4 <0> (ø)	⬇️
...cloud/pubsub/v1/StreamingSubscriberConnection.java	64.39% <100%> (+0.54%)	9 <0> (ø)	⬇️
.../com/google/cloud/pubsub/v1/MessageDispatcher.java	85.14% <0%> (-0.5%)	25% <0%> (ø)
...a/com/google/cloud/pubsub/v1/TopicAdminClient.java	65.18% <0%> (+1.48%)	32% <0%> (+2%)	⬆️
...google/cloud/pubsub/v1/stub/GrpcPublisherStub.java	95.75% <0%> (+1.88%)	17% <0%> (+1%)	⬆️
...oogle/cloud/pubsub/v1/SubscriptionAdminClient.java	69.08% <0%> (+2.89%)	52% <0%> (+6%)	⬆️
... and 1 more

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