[Data Explorer] Mount views dynamically with services

[ashwin-pc]

Description

Data explorer views are mounted dynamically on switching so that services for each view can be intialized beforehand. core and plugin servoces are also passed down to the view. The pattern followed here is identical to the application mounting flow for OSD.

Issues Resolved

Part of #4227

Screenshot

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 #4519 (6de5b35) into feature/data-explorer (d4acb33) will decrease coverage by 0.04%.
The diff coverage is 31.42%.

@@                    Coverage Diff                    @@
##           feature/data-explorer    #4519      +/-   ##
=========================================================
- Coverage                  66.56%   66.52%   -0.04%     
=========================================================
  Files                       3278     3280       +2     
  Lines                      62654    62700      +46     
  Branches                    9760     9766       +6     
=========================================================
+ Hits                       41703    41713      +10     
- Misses                     18585    18619      +34     
- Partials                    2366     2368       +2     

Flag	Coverage Δ
Linux	66.47% <31.42%> (-0.03%)	⬇️
Windows	66.47% <31.42%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
src/plugins/discover/public/plugin.ts	1.36% <0.00%> (-0.13%)	⬇️
.../data_explorer/public/components/app_container.tsx	33.33% <33.33%> (ø)
...lugins/data_explorer/public/components/sidebar.tsx	16.66% <100.00%> (ø)
...data_explorer/public/services/view_service/view.ts	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes