Support opensearch-sql:run and update developer_guide doc

[penghuo]

Description

1. Support opensearch-sql:run
2. Update developer_guide doc. add prometheus and filesystem description.
3. Add .java-version to .gitignore

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 #1099 (e52d905) into 2.x (42143b9) will decrease coverage by 2.51%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #1099      +/-   ##
============================================
- Coverage     98.29%   95.78%   -2.52%     
  Complexity     3465     3465              
============================================
  Files           347      357      +10     
  Lines          8645     9303     +658     
  Branches        550      669     +119     
============================================
+ Hits           8498     8911     +413     
- Misses          142      334     +192     
- Partials          5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.29% <ø> (ø)

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

Impacted Files	Coverage Δ
workbench/public/components/app.tsx	0.00% <0.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
...ublic/components/QueryResults/QueryResultsBody.tsx	68.32% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
workbench/public/utils/PanelWrapper.tsx	100.00% <0.00%> (ø)
workbench/public/components/Main/main.tsx	53.00% <0.00%> (ø)
workbench/public/application.tsx	0.00% <0.00%> (ø)
workbench/public/components/SQLPage/SQLPage.tsx	100.00% <0.00%> (ø)
workbench/public/components/Header/Header.tsx	100.00% <0.00%> (ø)
workbench/public/components/PPLPage/PPLPage.tsx	56.52% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[dai-chen]

Thanks for the changes!