BigQuery: Fixes Support for StandardSQLTypeName in Field.newBuilder(name, type).

[pmakani]

Fixes#4319 Support for StandardSQLTypeName in Field.newBuilder(name, type).

[codecov]

Codecov Report

Merging #4483 into master will increase coverage by <.01%.
The diff coverage is 81.81%.

@@ Coverage Diff @@## master #4483 +/- ##
============================================
+ Coverage 49.16% 49.16% +<.01% - Complexity 21913 21917 +4 
============================================
Files 2078 2078 Lines 207048 207059 +11 Branches 24084 24088 +4 ============================================
+ Hits 101789 101799 +10 - Misses 97116 97117 +1 
Partials 8143 8143

Impacted Files	Coverage Δ	Complexity Δ
...a/com/google/cloud/bigquery/LegacySQLTypeName.java	94.87% <100%> (+3.69%)	7 <1> (+3)	⬆️
...src/main/java/com/google/cloud/bigquery/Field.java	87.35% <66.66%> (-1.54%)	24 <1> (+1)

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[pmakani]

@sduskis PTAL