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NBT path structure #363

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NBT path structure #363

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Description

this adds functionality for parsing NBT paths

Describe the changes you've made. Link to any issues this PR fixes or addresses.
The changes I have made so far implement an NbtPath structure and a parser from a String to an NbtPath.
(from this issue)
#338

this is not fully complete: i have a few questions i need a bit of clarification on:

  • Should I still store spans in the enum variants of NbtPathNode? or is that just redundant because I'm already storing owned values (mainly because of escape characters in quoted strings)
  • What other types should be able to convert into NbtPath besides String? (like &str?)
  • From the original issue: "Once the NbtPath is parsed, lookups can be performed on &Compound or &mut Compound values." -- how should I go about implementing this? i'm having trouble visualizing the structure of a large Compound with many parts and how i'd traverse through it

soo yea that's all for now :p

Still missing indexing into arrays and named compounds are buggy.
But that'll be fixed soon.
i also renamed my parse function cus parse_or_error is pretty
repetitive, as it's clear that it returns a result value
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