fix: add retry logic for readrows

[pmakani]

Fixes #86

[codecov]

Codecov Report

Merging #263 into master will increase coverage by 0.60%.
The diff coverage is 83.42%.

@@             Coverage Diff              @@
##             master     #263      +/-   ##
============================================
+ Coverage     74.16%   74.76%   +0.60%     
- Complexity      382      410      +28     
============================================
  Files            45       48       +3     
  Lines          2570     2754     +184     
  Branches        101      126      +25     
============================================
+ Hits           1906     2059     +153     
- Misses          610      624      +14     
- Partials         54       71      +17     

Impacted Files	Coverage Δ	Complexity Δ
...rage/v1/stub/readrows/ApiResultRetryAlgorithm.java	78.26% <78.26%> (ø)	9.00 <9.00> (?)
...rage/v1/stub/readrows/ReadRowsAttemptCallable.java	78.94% <78.94%> (ø)	16.00 <16.00> (?)
...age/v1/stub/readrows/ReadRowsRetryingCallable.java	95.23% <95.23%> (ø)	2.00 <2.00> (?)
...uery/storage/v1/stub/EnhancedBigQueryReadStub.java	88.05% <96.55%> (+5.13%)	8.00 <3.00> (+1.00)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update de1c24d...90c66bb. Read the comment docs.