Vertica export bucket prefix path support implementation.

[VenkatasivareddyTR]

Issue #, if available:

Description of changes:
The Vertica connector previously required the export bucket parameter to be a bucket name only; folder paths were not supported. This change adds support for both bucket names and bucket names with folder paths.

Before fixing supported format: my_vertica_exportbucket.
After fixing supported format: my_vertica_exportbucket and my_vertica_exportbucket/vertica.
Vertica Export Bucket Prefix Path Support Testing.docx

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.98%. Comparing base (f3521ad) to head (4648242).
Report is 110 commits behind head on master.

Files with missing lines	Patch %	Lines
...ena/connectors/vertica/VerticaMetadataHandler.java	90.90%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2626      +/-   ##
============================================
+ Coverage     60.68%   60.98%   +0.30%     
- Complexity     3871     3888      +17     
============================================
  Files           593      591       -2     
  Lines         22130    22144      +14     
  Branches       2732     2734       +2     
============================================
+ Hits          13430    13505      +75     
+ Misses         7398     7322      -76     
- Partials       1302     1317      +15     

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