Fix | Mark spatial datatypes as valid

[peterbae]

Addresses issue #1031 and #1038.

For #1031, I changed the isValid bit to be set to true by default, as it is stated in the CLR specs. Leaving this isValid bit to false makes some of the Spatial Datatype operations on the server's end fail.

For #1038, I've declared the default constructors as protected, to allow extension of Geometry and Geography classes.

I've also noticed that setObject() using Geography/Geometry weren't working as intended, so I'm fixing that as well.

[peterbae]

mssql-jdbc-7.3.1-SNAPSHOT-preview-PR1035.zip

Attaching the driver from this PR for testing.

[codecov-io]

Codecov Report

Merging #1035 into dev will increase coverage by 0.02%.
The diff coverage is 87.5%.

@@             Coverage Diff              @@
##                dev    #1035      +/-   ##
============================================
+ Coverage     50.83%   50.85%   +0.02%     
- Complexity     2964     2967       +3     
============================================
  Files           120      120              
  Lines         28001    28011      +10     
  Branches       4686     4686              
============================================
+ Hits          14233    14245      +12     
+ Misses        11616    11613       -3     
- Partials       2152     2153       +1

Flag	Coverage Δ	Complexity Δ
#JDBC42	50.43% <87.5%> (-0.01%)	2928 <4> (ø)
#JDBC43	50.7% <87.5%> (+0.02%)	2963 <4> (+6)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	68.78% <100%> (+0.07%)	0 <0> (ø)	⬇️
...osoft/sqlserver/jdbc/SQLServerSpatialDatatype.java	85.49% <100%> (+0.11%)	289 <0> (ø)	⬇️
...n/java/com/microsoft/sqlserver/jdbc/DataTypes.java	80.07% <100%> (+0.15%)	6 <0> (ø)	⬇️
...in/java/com/microsoft/sqlserver/jdbc/Geometry.java	51.56% <66.66%> (-0.82%)	15 <2> (ø)
...n/java/com/microsoft/sqlserver/jdbc/Geography.java	51.56% <66.66%> (-0.82%)	15 <2> (ø)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	63.36% <0%> (-0.44%)	95% <0%> (-1%)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	47.3% <0%> (-0.22%)	112% <0%> (+1%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	44.14% <0%> (ø)	327% <0%> (+2%)	⬆️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	58.03% <0%> (+0.03%)	0% <0%> (ø)	⬇️
... and 2 more

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