SqlBulkCopy support for JSON datatype

[apoorvdeshmukh]

This PR adds SqlBulkCopy support for for JSON datatype.
It supports streaming as well for multibyte characters.
A new testcase JsonBulkCopyTest has been introduced to test changes with CommandBehavior Default and SequentialAccess and with EnableStreaming set and unset.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 30 lines in your changes missing coverage. Please review.

Project coverage is 71.83%. Comparing base (2f0de19) to head (32df131).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
.../netcore/src/Microsoft/Data/SqlClient/TdsParser.cs	26.31%	14 Missing ⚠️
...nt/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs	26.31%	14 Missing ⚠️
...etcore/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs	80.00%	1 Missing ⚠️
.../netfx/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2916      +/-   ##
==========================================
- Coverage   71.88%   71.83%   -0.05%     
==========================================
  Files         294      294              
  Lines       60253    60287      +34     
==========================================
- Hits        43311    43310       -1     
- Misses      16942    16977      +35     

Flag	Coverage Δ
addons	92.90% <ø> (ø)
netcore	75.77% <37.50%> (-0.04%)	⬇️
netfx	70.39% <37.50%> (-0.03%)	⬇️

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