Fix/improve StringBuilder usages

[simon04]

• Replace string concatenation w/ StringBuilder in loops
• Avoid string concatenation in StringBuilder.append()

[codecov-io]

Codecov Report

Merging #861 into dev will increase coverage by 0.05%.
The diff coverage is 44.82%.

@@             Coverage Diff              @@
##                dev     #861      +/-   ##
============================================
+ Coverage     48.67%   48.73%   +0.05%     
- Complexity     2793     2796       +3     
============================================
  Files           116      116              
  Lines         27875    27877       +2     
  Branches       4650     4650              
============================================
+ Hits          13569    13585      +16     
+ Misses        12099    12087      -12     
+ Partials       2207     2205       -2

Flag	Coverage Δ	Complexity Δ
#JDBC42	48.23% <44.82%> (+0.07%)	2754 <0> (+6)	⬆️
#JDBC43	48.64% <44.82%> (+0.07%)	2795 <0> (+4)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...oft/sqlserver/jdbc/SQLServerParameterMetaData.java	24.56% <0%> (-0.06%)	31 <0> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	59.57% <0%> (+0.05%)	135 <0> (ø)	⬇️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	61.42% <0%> (+0.43%)	90 <0> (+1)	⬆️
...m/microsoft/sqlserver/jdbc/SQLServerException.java	77.44% <100%> (ø)	31 <0> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.73% <100%> (-0.07%)	263 <0> (ø)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	56.5% <100%> (+0.34%)	0 <0> (ø)	⬇️
...soft/sqlserver/jdbc/SQLServerDatabaseMetaData.java	34.84% <80%> (-0.08%)	66 <0> (ø)
...om/microsoft/sqlserver/jdbc/SimpleInputStream.java	52.94% <0%> (-1.48%)	11% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	32.57% <0%> (-0.12%)	255% <0%> (ø)
... and 6 more

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[rene-ye]

Please format the code with mssql-jdbc_formatter.xml found in the root of the repository.

[simon04]

Thanks for the pointer. I amended my commits. Hopefully, I didn't forget something.