[Backport workspace-pr-integr]Add support for dynamic application configurations (#5855)

[SuZhou-Joe]

• Add application configuration service

• update API path name

• implement two APIs/interfaces

• expose get function for other plugins to use

• update interfaces

• implement the APIs and interfaces

• add license and jsdoc

• update docs

• add more docs

• update variable name

• remove unnecessary dependency

• format readme

• use osd version

• remove debugging info

• update logging

• remove lint js

• remove logs

• update name style

• update

• update function visibility and error function

• fix unit test failures

• add unit test

• remove lint file

• add more tests

• add unit tests for routes

• add remaining unit tests

• add enabled to this plugin

• update readme to mention experimental

• update change log

• dummy commit to trigger workflow rerun

• remove experimental

• add key to yml file

• remove i18n

• remove lint rc

• update comment style

• add input validation

• update unit tests

• prevent multiple registration

• add return types

• update readme wording

• add unit test to the plugin class about double register

• move related ymls

• move validation to a function

• use trimmed versions

• reword changelog entry

• readability

• add back yml change

---

Description

Issues Resolved

Screenshot

Testing the changes

Check List

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.57692% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 67.04%. Comparing base (bb8d0ac) to head (92720b8).

Files	Patch %	Lines
.../plugins/application_config/server/routes/index.ts	76.47%	8 Missing ⚠️
src/plugins/application_config/server/plugin.ts	78.94%	3 Missing and 1 partial ⚠️
.../plugins/application_config/server/string_utils.ts	77.77%	1 Missing and 1 partial ⚠️
...lication_config/server/opensearch_config_client.ts	97.61%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           workspace-pr-integr     #302      +/-   ##
=======================================================
+ Coverage                67.01%   67.04%   +0.02%     
=======================================================
  Files                     3340     3344       +4     
  Lines                    64907    65011     +104     
  Branches                 10488    10496       +8     
=======================================================
+ Hits                     43499    43588      +89     
- Misses                   18833    18845      +12     
- Partials                  2575     2578       +3     

Flag	Coverage Δ
Linux_	66.39% <85.57%> (+0.03%)	⬆️
_1	32.56% <ø> (ø)
_2	55.39% <ø> (ø)
_3	43.45% <85.57%> (+0.13%)	⬆️
_4	35.15% <ø> (ø)

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