Adds non allocating alternatives to ZON parse functions (#22916)

* Adds "flat" alternatives to zon.parse.from* that don't support pointers

* Fixes documentation

* Removes flat postfix from non allocating functions, adds alloc to others

* Stops using alloc variant in tests where not needed
5a0cf21775Mason Remaley committed on 8/25/2025, 4:03:08 PM· committed by GitHubparent37f4bee
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