[MD] Register data source plugin interface to route handler context

[zhongnansu]

Signed-off-by: Zhongnan Su [email protected]

Description

• Create data source plugin context class that contains the interface to retrieve a client by datasource id.
• Register data source plugin context to route handler context.
• The caller plugin, for example, search plugin will use the interface as below to retrieve a data source client. It will be further implementer in other tasks. #1988

const dataSourceClient = await context.data_source.opensearch.getClient(id)

• Init DataSourceClient class, with a dummy implementation of functions required by interfaces , it will be further implemented in other PRs
• Init DataSourceService class, with interfaces defined

Issues Resolved

#1979

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass
    • [ ] yarn test:jest
    • [ ] yarn test:jest_integration
    • [ ] yarn test:ftr
• [ ] New functionality has been documented.
• [ ] Commits are signed per the DCO using --signoff

[codecov-commenter]

Codecov Report

Merging #2121 (025dcca) into feature/multi-datasource (456b5c7) will increase coverage by 0.01%. The diff coverage is n/a.

@@                     Coverage Diff                      @@
##           feature/multi-datasource    #2121      +/-   ##
============================================================
+ Coverage                     67.47%   67.48%   +0.01%     
============================================================
  Files                          3080     3080              
  Lines                         59246    59246              
  Branches                       9010     9010              
============================================================
+ Hits                          39977    39983       +6     
+ Misses                        17080    17076       -4     
+ Partials                       2189     2187       -2     

Impacted Files	Coverage Δ
...ic/application/models/sense_editor/sense_editor.ts	64.88% <0.00%> (+0.88%)	:arrow_up:
packages/osd-optimizer/src/node/cache.ts	52.77% <0.00%> (+2.77%)	:arrow_up:
...s/osd-optimizer/src/node/node_auto_tranpilation.ts	87.75% <0.00%> (+4.08%)	:arrow_up:

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[zhongnansu]

look forward for more coverage

definitely, the existing tests can pass now. I am merging in to unblock others. Tracking UT improvement here for this module. https://github.com/opensearch-project/OpenSearch-Dashboards/issues/2163