[Issue-668] Manage all the source and sink configurations in Flink ConfigOptions

[thekingofcity]

Signed-off-by: thekingofcity [email protected]

Change log description
It could be better if we have a central place to store all the client configurations, but now we are separating them in each of the source/sink builder.
This is not an ideal way because these configurations are not clearly exposed to the end users.

Purpose of the change
Fix #668

What the code does
Use a new PravegaOptions to set and get Pravega client config.

How to verify it
.\gradlew clean build should pass.

[codecov]

Codecov Report

Merging #670 (be45af3) into master (336172a) will decrease coverage by 0.70%.
The diff coverage is 73.12%.

@@             Coverage Diff              @@
##             master     #670      +/-   ##
============================================
- Coverage     82.62%   81.92%   -0.71%     
- Complexity      574      588      +14     
============================================
  Files            60       62       +2     
  Lines          2677     2877     +200     
  Branches        226      238      +12     
============================================
+ Hits           2212     2357     +145     
- Misses          291      339      +48     
- Partials        174      181       +7     

Impacted Files	Coverage Δ
...nectors/flink/config/PravegaClientConfigUtils.java	35.48% <35.48%> (ø)
.../connectors/flink/source/PravegaSourceBuilder.java	60.00% <57.73%> (-5.22%)	⬇️
...a/connectors/flink/config/PravegaClientConfig.java	100.00% <100.00%> (ø)
...pravega/connectors/flink/source/PravegaSource.java	100.00% <100.00%> (ø)
.../connectors/flink/source/PravegaSourceOptions.java	90.90% <100.00%> (+28.40%)	⬆️
...link/source/enumerator/PravegaSplitEnumerator.java	87.69% <100.00%> (+0.19%)	⬆️
...ectors/flink/source/reader/PravegaSplitReader.java	85.36% <100.00%> (-2.44%)	⬇️

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