Multiple Datasource Support

[mengweieric]

Description

Draft PR for adding datasource selector

Issues Resolved

#4482 #4991

Screenshot

[will attach]

Testing the changes

Check List

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

[codecov]

Codecov Report

Merging #4931 (a1338b9) into main (46d7c2d) will decrease coverage by 0.07%.
Report is 1 commits behind head on main.
The diff coverage is 8.91%.

@@            Coverage Diff             @@
##             main    #4931      +/-   ##
==========================================
- Coverage   66.50%   66.44%   -0.07%     
==========================================
  Files        3403     3409       +6     
  Lines       65026    65093      +67     
  Branches    10401    10410       +9     
==========================================
+ Hits        43243    43248       +5     
- Misses      19214    19275      +61     
- Partials     2569     2570       +1     

Flag	Coverage Δ
Linux_1	?
Linux_2	55.31% <ø> (ø)
Linux_3	44.55% <10.00%> (-0.05%)	⬇️
Linux_4	34.83% <2.89%> (-0.07%)	⬇️
Windows_1	34.77% <6.02%> (-0.07%)	⬇️
Windows_2	55.27% <ø> (ø)
Windows_3	44.56% <10.00%> (-0.05%)	⬇️
Windows_4	34.83% <2.89%> (-0.07%)	⬇️

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

Files	Coverage Δ
...ources/datasource_selector/datasource_selector.tsx	100.00% <100.00%> (ø)
src/plugins/data/public/index.ts	85.71% <ø> (ø)
src/plugins/discover/common/index.ts	100.00% <100.00%> (ø)
src/plugins/data/public/plugin.ts	0.00% <0.00%> (ø)
.../data/public/data_sources/datasource/datasource.ts	0.00% <0.00%> (ø)
...a/public/data_sources/datasource_services/types.ts	0.00% <0.00%> (ø)
src/plugins/discover/public/plugin.ts	0.00% <0.00%> (ø)
.../discover/public/datasources/default_datasource.ts	0.00% <0.00%> (ø)
...ins/data/public/data_sources/datasource/factory.ts	0.00% <0.00%> (ø)
.../data_explorer/public/components/sidebar/index.tsx	3.44% <0.00%> (+0.32%)	⬆️
... and 2 more

... and 4 files with indirect coverage changes