[Backport 2.x] Prometheus Query Exemplars (#1782)

[vmmusings]

Signed-off-by: Vamsi Manohar reddyvam@amazon.com
(cherry picked from commit 430d7a9)

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #1905 (05cee51) into 2.x (4d7a02c) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #1905      +/-   ##
============================================
+ Coverage     97.38%   97.41%   +0.02%     
- Complexity     4598     4642      +44     
============================================
  Files           401      408       +7     
  Lines         11377    11506     +129     
  Branches        835      839       +4     
============================================
+ Hits          11080    11209     +129     
  Misses          290      290              
  Partials          7        7              

Flag	Coverage Δ
sql-engine	97.41% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...theus/data/constants/PrometheusFieldConstants.java	0.00% <ø> (ø)
...ch/sql/prometheus/client/PrometheusClientImpl.java	100.00% <100.00%> (ø)
...mentation/QueryExemplarFunctionImplementation.java	100.00% <100.00%> (ø)
.../resolver/QueryExemplarsTableFunctionResolver.java	100.00% <100.00%> (ø)
...ions/resolver/QueryRangeTableFunctionResolver.java	100.00% <100.00%> (ø)
...response/QueryExemplarsFunctionResponseHandle.java	100.00% <100.00%> (ø)
...ons/response/QueryRangeFunctionResponseHandle.java	100.00% <100.00%> (ø)
...s/scan/QueryExemplarsFunctionTableScanBuilder.java	100.00% <100.00%> (ø)
.../scan/QueryExemplarsFunctionTableScanOperator.java	100.00% <100.00%> (ø)
...ions/scan/QueryRangeFunctionTableScanOperator.java	100.00% <100.00%> (ø)
... and 4 more