fix: add pojo support

[thebrianchen]

No description provided.

[codecov]

Codecov Report

Merging #265 into bc/bulk-master will decrease coverage by 0.17%.
The diff coverage is 70.16%.

@@                 Coverage Diff                  @@
##             bc/bulk-master     #265      +/-   ##
====================================================
- Coverage             73.72%   73.55%   -0.18%     
- Complexity             1087     1088       +1     
====================================================
  Files                    67       67              
  Lines                  5866     5883      +17     
  Branches                642      642              
====================================================
+ Hits                   4325     4327       +2     
- Misses                 1341     1356      +15     
  Partials                200      200              

Impacted Files	Coverage Δ	Complexity Δ
.../com/google/cloud/firestore/BulkWriterOptions.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...java/com/google/cloud/firestore/FirestoreImpl.java	78.19% <50.00%> (ø)	25.00 <1.00> (ø)
...in/java/com/google/cloud/firestore/BulkWriter.java	64.24% <64.24%> (-5.88%)	26.00 <26.00> (ø)
...java/com/google/cloud/firestore/UpdateBuilder.java	95.00% <93.10%> (ø)	75.00 <17.00> (ø)
...n/java/com/google/cloud/firestore/RateLimiter.java	100.00% <100.00%> (ø)	13.00 <1.00> (ø)
...n/java/com/google/cloud/firestore/Transaction.java	97.56% <100.00%> (ø)	11.00 <1.00> (ø)
...in/java/com/google/cloud/firestore/WriteBatch.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
...n/java/com/google/cloud/firestore/WriteResult.java	50.00% <100.00%> (ø)	4.00 <1.00> (ø)
...a/com/google/cloud/firestore/BatchWriteResult.java	100.00% <0.00%> (ø)	4.00% <0.00%> (+1.00%)
... and 2 more

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