Add support for Server-Sent Events (SSE) in API Explorer and configuration

[dvaJi]

Description

Added support for Server-Sent Events (SSE) to handle streaming responses in the docusaurus-theme-openapi-docs library. This includes a new handleEventStream function to process SSE responses and update the state accordingly.

Motivation and Context

This change is required to support APIs that use Server-Sent Events (SSE) for streaming data. It solves the problem of handling real-time updates from the server, which was not supported previously (it waits until the request is closed). This enhancement allows users to see live updates in the API response section.

How Has This Been Tested?

Tested locally by linking the modified docusaurus-theme-openapi-docs library to another project and verifying that SSE responses are handled correctly. Specifically:

• Verified that the response updates in real-time as data is received from the server.
• Ensured that non-SSE responses are still handled correctly.
• Tested with various content types and ensured proper decoding and display.

Screenshots (if appropriate)

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[github-actions]

Visit the preview URL for this PR (updated for commit 54164dc):

https://docusaurus-openapi-36b86--pr1041-j1c1n0v9.web.app

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[sserrata]

Thanks for the contribution @dvaJi, planning to review it for the next release.