List tables/metrics using information_schema in source command.

[vamsi-amazon]

Signed-off-by: vamsi-amazon reddyvam@amazon.com

Description

List Metrics using information_schema in source command.
Example commands.

List all tables/metrics.

• source = prometheus.information_schema.tables

Issues Resolved

#986

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #914 (fdf926e) into 2.x (b843639) will decrease coverage by 2.62%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x     #914      +/-   ##
============================================
- Coverage     97.57%   94.95%   -2.63%     
- Complexity     3153     3185      +32     
============================================
  Files           305      318      +13     
  Lines          7874     8641     +767     
  Branches        512      639     +127     
============================================
+ Hits           7683     8205     +522     
- Misses          190      382     +192     
- Partials          1       54      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	97.60% <100.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...java/org/opensearch/sql/storage/StorageEngine.java	100.00% <ø> (ø)
...ql/opensearch/storage/OpenSearchStorageEngine.java	100.00% <ø> (ø)
...rg/opensearch/sql/ppl/config/PPLServiceConfig.java	100.00% <ø> (ø)
...theus/data/constants/PrometheusFieldConstants.java	0.00% <ø> (ø)
...rage/implementor/PrometheusDefaultImplementor.java	100.00% <ø> (ø)
...ain/java/org/opensearch/sql/analysis/Analyzer.java	100.00% <100.00%> (ø)
.../analysis/CatalogSchemaIdentifierNameResolver.java	100.00% <100.00%> (ø)
...ava/org/opensearch/sql/utils/SystemIndexUtils.java	100.00% <100.00%> (ø)
...ch/sql/prometheus/client/PrometheusClientImpl.java	100.00% <100.00%> (ø)
...equest/system/PrometheusDescribeMetricRequest.java	100.00% <100.00%> (ø)
... and 21 more

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[penghuo]

Thanks.