[Workers KV] Adding guidance on coalescing keys

[Oxyjun]

Summary

Including a section Reducing cardinality by coalescing keys in the Read key-value pairs chapter.

This content was originally submitted in this PR https://github.com/cloudflare/cloudflare-docs/pull/9874/files (which is now closed).

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added guidance on coalescing keys in the Workers KV documentation to improve key-value pair retrieval efficiency.

• Introduced a new section on reducing cardinality by coalescing keys in the Read key-value pairs chapter.
• Described techniques for merging keys into a super KV entry and storing values in metadata with shared prefixes.
• Highlighted advantages and disadvantages of coalescing keys for better cache management.

Modified Files

• src/content/docs/kv/api/read-key-value-pairs.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/kv/	@elithrar, @thomasgauvin, @rts-rob, @oxyjun, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://7c8ac3bf.preview.developers.cloudflare.com
Preview Branch URL: https://jun-kv-advanced-kv-guide.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/kv/api/read-key-value-pairs/	https://jun-kv-advanced-kv-guide.preview.developers.cloudflare.com/kv/api/read-key-value-pairs/