Add Tanstack Start handler

[djfarrelly]

Summary

New handler for the Tanstack Start framework.

Notes

Since the framework expects handles for each GET, POST, PUT, the serve handler doesn't expose a default handler which doesn't work with the test framework. I'd love some input from @jpwilliams on a good approach there.

Folks in our community have recommended using the h3 handler instead - we may want to shift to use that instead of emulating the edge handler: https://discord.com/channels/842170679536517141/1324205318690832446/1326578673498718319

Checklist

• Added a docs PR that references this PR
• Added unit/integration tests
• Added changesets if applicable

Related

• INN-

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Latest commit: e85500c

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