Fixing xcontent imports

[khushbr]

Is your feature request related to a problem? Please provide an existing Issue # , or describe.
Fixing the xcontent imports to handle the OpenSearch core refactoring change for XContent
Issue: #406

Describe the solution you are proposing
Fixing the XContent Import in code for 2.x

Check List

• [ y] New functionality includes testing.
  • [ y] All tests pass
• [N/A] New functionality has been documented.
  • [ N/A] New functionality has javadoc added
• [ y] Commits are signed per the DCO using --signoff

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[dzane17]

Some UTs failing?

[kkhatua]

Only XContentBuilder moved to core and not the others in common?

[khushbr]

Based on the commit in core, the current initiative is to only move the xcontent base classes to common, see more detail at opensearch-project/OpenSearch@cb402cb

[khushbr]

Some UTs failing?

Thank you for pointing this out, fixed the failing UTs.

[codecov-commenter]

Codecov Report

Merging #410 (02f3cb4) into 2.x (b03c2ca) will increase coverage by 0.15%.
The diff coverage is n/a.

❗ Current head 02f3cb4 differs from pull request most recent head b70c9d7. Consider uploading reports for the commit b70c9d7 to get more accurate results

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@@             Coverage Diff              @@
##                2.x     #410      +/-   ##
============================================
+ Coverage     70.88%   71.04%   +0.15%     
- Complexity      377      378       +1     
============================================
  Files            44       44              
  Lines          2597     2597              
  Branches        176      176              
============================================
+ Hits           1841     1845       +4     
+ Misses          647      644       -3     
+ Partials        109      108       -1     

Impacted Files	Coverage Δ
...performanceanalyzer/PerformanceAnalyzerPlugin.java	76.92% <ø> (ø)
...config/PerformanceAnalyzerClusterConfigAction.java	85.96% <ø> (ø)
...action/config/PerformanceAnalyzerConfigAction.java	93.18% <ø> (ø)
...rformanceAnalyzerOverridesClusterConfigAction.java	80.95% <ø> (ø)
...nceanalyzer/http_action/whoami/WhoAmIResponse.java	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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