feat: breaks infinite cycle when looking for fields in recursive structures.

[yuridevx]

My machine has crashed when I've tried to use Huma for the new micro-service that I'm developing.

// Node is a custom type for testing recursive definition for huma.Register
type Node struct {
	Name  string          `json:"name"`
	Nodes []Node          `json:"nodes,omitempty"`
	Left  *Node           `json:"left,omitempty"`
	Named map[string]Node `json:"named,omitempty"`
}

This pr breaks the cycle in findInType by adding visited map[reflect.Type]bool as a parameter.
I haven't spent much time figuring out semantics and usage of findInType, so it might be a wrong solution. However I would like to hear your thoughts on the issue.

[victoraugustolls]

@danielgtaylor, sorry if I'm barging myself in here! I just guessed that reviewing this PR would be a nice opportunity to learn more about the code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.22%. Comparing base (c312351) to head (b32a525).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   95.14%   95.22%   +0.08%     
==========================================
  Files          19       19              
  Lines        2782     2788       +6     
==========================================
+ Hits         2647     2655       +8     
+ Misses         98       97       -1     
+ Partials       37       36       -1     

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[yuridevx]

@danielgtaylor @victoraugustolls I've adjusted visited to struct{} to match the rest of project usage, also I've added break to getFields

[danielgtaylor]

@yuridevx thank you! 👍