Add OpenAPI specification for get and create saved object APIs

[BionIT]

Description

This change adds OpenAPI specification for get and create saved object APIs, and also added a readme with instructions about how to spin off swagger UI

Issues Resolved

Related to https://github.com/opensearch-project/OpenSearch-Dashboards/issues/6719

Screenshot

Below is after running npx serve locally in the folder where the yaml file is located

Changelog

• doc: Add OpenAPI specification for GET and CREATE saved object API

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.51%. Comparing base (293e1a5) to head (0c72d12).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6799 +/- ## ========================================== - Coverage 67.55% 67.51% -0.05% ========================================== Files 3428 3428 Lines 67340 67340 Branches 10994 10994 ========================================== - Hits 45492 45465 -27 - Misses 19178 19199 +21 - Partials 2670 2676 +6 ``` | [Flag](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | Coverage Δ | | |---|---|---| | [Linux_1](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `33.04% <ø> (ø)` | | | [Linux_2](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `55.13% <ø> (ø)` | | | [Linux_3](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `45.15% <ø> (-0.02%)` | :arrow_down: | | [Linux_4](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `34.73% <ø> (ø)` | | | [Windows_1](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `33.06% <ø> (ø)` | | | [Windows_2](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `?` | | | [Windows_3](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `?` | | | [Windows_4](https://app.codecov.io/gh/opensearch-project/OpenSearch-Dashboards/pull/6799/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project#carryforward-flags-in-the-pull-request-comment) to find out more.

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