Improved performance degradation while maintaining JDBC compliance with results from sp_fkeys

[rene-ye]

Addresses issue #665. Affects getImportedKeys, getExportedKeys, and getCrossReference. Uses a single callable statement to create a temporary variable and edits UPDATE_RULE/DELETE_RULE before returning. Also changes some column names to conform to JDBC specs. Tests appear to be flawed. Changed temporarily and will revisit in the future.

[codecov-io]

Codecov Report

Merging #677 into dev will decrease coverage by 0.15%.
The diff coverage is 80%.

@@             Coverage Diff              @@
##                dev     #677      +/-   ##
============================================
- Coverage     48.22%   48.07%   -0.16%     
+ Complexity     2583     2579       -4     
============================================
  Files           113      113              
  Lines         26626    26572      -54     
  Branches       4449     4450       +1     
============================================
- Hits          12840    12774      -66     
- Misses        11644    11658      +14     
+ Partials       2142     2140       -2

Flag	Coverage Δ	Complexity Δ
#JDBC42	47.99% <80%> (-0.14%)	2574 <8> (-4)
#JDBC43	47.94% <80%> (-0.08%)	2575 <8> (+2)

Impacted Files	Coverage Δ	Complexity Δ
...soft/sqlserver/jdbc/SQLServerDatabaseMetaData.java	32.42% <80%> (-3.61%)	58 <8> (+3)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	38.54% <0%> (-0.65%)	42% <0%> (-1%)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	60.91% <0%> (-0.44%)	88% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	32.78% <0%> (-0.36%)	242% <0%> (-3%)
...n/java/com/microsoft/sqlserver/jdbc/DataTypes.java	77.85% <0%> (-0.17%)	4% <0%> (-1%)
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	50.68% <0%> (-0.17%)	157% <0%> (ø)
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	45.71% <0%> (-0.08%)	288% <0%> (-1%)
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	63.41% <0%> (+0.05%)	0% <0%> (ø)	⬇️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	55.13% <0%> (+0.06%)	0% <0%> (ø)	⬇️

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