fix: Add special type tests for Json writer and fix some type mapping issues

[yirutang]

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Fixes #<issue_number_goes_here> ☕️

[yoshi-code-bot]

Suggested change

	testNumerics.put("test_numerics", new JSONArray(new String[]{"123.4", "-9000000"}));
	testNumerics.put("test_numerics", new JSONArray(new String[] {"123.4", "-9000000"}));

[stephaniewang526]

Some unit tests are failing -- they need to be updated:

Error:  Failures: 
Error:    BQTableSchemaToProtoDescriptorTest.testSimpleTypes:105->isDescriptorEqual:78 test_field_type expected:<STRING> but was:<BYTES>
Error:    BQTableSchemaToProtoDescriptorTest.testStructComplex:225->isDescriptorEqual:78 test_time expected:<INT64> but was:<STRING>
Error:    BQTableSchemaToProtoDescriptorTest.testSimpleTypes:104->isDescriptorEqual:77 test_field_type expected:<STRING> but was:<INT64>

You could run mvn clean install locally in the project root to repro these test failures.

[codecov]

Codecov Report

Merging #725 (d620bb1) into master (f4de72c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #725   +/-   ##
=========================================
  Coverage     80.40%   80.40%           
  Complexity      957      957           
=========================================
  Files            73       73           
  Lines          5334     5334           
  Branches        405      405           
=========================================
  Hits           4289     4289           
  Misses          877      877           
  Partials        168      168           

Impacted Files	Coverage Δ	Complexity Δ
...orage/v1alpha2/BQTableSchemaToProtoDescriptor.java	98.48% <100.00%> (ø)	8.00 <0.00> (ø)
...torage/v1beta2/BQTableSchemaToProtoDescriptor.java	98.48% <100.00%> (ø)	8.00 <0.00> (ø)

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