Performance | Refactor SELECT_METHOD in SQLServerConnection to improve performance

[peterbae]

Fixes issue #981

[codecov-io]

Codecov Report

Merging #987 into dev will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #987      +/-   ##
============================================
- Coverage     50.61%   50.59%   -0.02%     
+ Complexity     2921     2919       -2     
============================================
  Files           120      120              
  Lines         27996    27993       -3     
  Branches       4681     4679       -2     
============================================
- Hits          14170    14164       -6     
  Misses        11530    11530              
- Partials       2296     2299       +3

Flag	Coverage Δ	Complexity Δ
#JDBC42	50.15% <100%> (+0.01%)	2879 <0> (+1)	⬆️
#JDBC43	50.51% <100%> (+0.02%)	2915 <0> (-1)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	46.45% <100%> (+0.01%)	342 <0> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/SimpleInputStream.java	52.23% <0%> (-1.5%)	11% <0%> (-1%)
...a/com/microsoft/sqlserver/jdbc/PLPInputStream.java	58.57% <0%> (-1.19%)	33% <0%> (-1%)
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	68.47% <0%> (-0.12%)	0% <0%> (ø)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	55.68% <0%> (-0.07%)	0% <0%> (ø)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	39% <0%> (+0.43%)	43% <0%> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	45.05% <0%> (+1.09%)	15% <0%> (ø)	⬇️

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