Fix Sql Server Connector to Support Case-Sensitive Collation

[Trianz-Akshay]

Issue #, if available:

1. Invalid object name SYS.COLUMNS error occurs in Sql server Connector when case-sensitive collation is enabled.
2. Unable to query uppercase table names when case-sensitive collation is enabled.

Description of changes:
Uppercase SYS.COLUMNS system view is not available in Sql Server when case-sensitive collation is enabled. Changed it to lowercase sys.columns and other respective queries(partition).
Added a method getExactCaseObjectName() which retrieves the exact schema and table name from Sql Server instead of converting it to uppercase.

Please find attached functional test results.
SQLSERVER_FUNCTIONAL_TEST.csv

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[codecov]

Codecov Report

Attention: Patch coverage is 69.51220% with 25 lines in your changes missing coverage. Please review.

Project coverage is 61.14%. Comparing base (f3521ad) to head (495f4fc).
Report is 94 commits behind head on master.

Files with missing lines	Patch %	Lines
...rs/sqlserver/SqlServerCaseInsensitiveResolver.java	77.04%	8 Missing and 6 partials ⚠️
...connectors/sqlserver/SqlServerMetadataHandler.java	47.61%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2629      +/-   ##
============================================
+ Coverage     60.68%   61.14%   +0.45%     
- Complexity     3871     3929      +58     
============================================
  Files           593      594       +1     
  Lines         22130    22354     +224     
  Branches       2732     2766      +34     
============================================
+ Hits          13430    13668     +238     
+ Misses         7398     7348      -50     
- Partials       1302     1338      +36     

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