Add posibility to render file array and object example for 'multipart/form-data'

[v50553490-cyber]

Description

• Added posibility to render array of binaries for 'multipart/form-data'.
• Render object example via <LiveApp/>.
• Split FormBodyItem into two files (may be improved, but anyways better than now).
• Little changes around to support the enhancement.

Motivation and Context

The commit makes it possible to render an array of files and examples for objects, similar to how swagger UI does it.

How Has This Been Tested?

• Locally with my own .yaml files.
• Checked all demos for issues.
• yarn test

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 2e10f27):

https://docusaurus-openapi-36b86--pr1266-zfbernhg.web.app

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