Feat(Mesh): Transparent proxying

[lmilan]

Description

Fixes #1791
Fixes #1995

Preview Links

• https://deploy-preview-3933--kongdeveloper.netlify.app/mesh/transparent-proxying/
• https://deploy-preview-3933--kongdeveloper.netlify.app/how-to/configure-transparent-proxying/

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

[netlify]

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