[Enhancement] Add deprecated support to schema items

[sserrata]

Description

See #360 for background

Motivation and Context

Allows for gracefully deprecating schema properties/items.

How Has This Been Tested?

Tested with Petstore API

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Visit the preview URL for this PR (updated for commit 70dbf17):

https://docusaurus-openapi-36b86--pr367-b7xl4b72.web.app

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[github-actions]

Size Change: +14.2 kB (0%)

Total Size: 4.16 MB

Filename	Size	Change
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demo/build/assets/js/cf07762b.********.js	25.7 kB	+198 B (+1%)
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ℹ️ View Unchanged

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