refactor interface{} to any

[nilsocket]

• Convert empty interface interface{} to any wherever possible.
• Use sliceToLookupMap() helper function with generics to remove redundant code.

[Copilot]

Pull Request Overview

This PR modernizes the codebase by replacing all occurrences of interface{} with the any type alias, which was introduced in Go 1.18 as a cleaner, more readable alternative. The changes are purely syntactic and maintain the same runtime behavior.

Key changes:

• Replace interface{} with any throughout the entire codebase
• Simplify duplicate logic in maps/maps.go by introducing a generic helper function
• Remove extraneous blank line at end of parsers/huml/huml.go
• Fix formatting/whitespace in several files

Reviewed Changes

Copilot reviewed 55 out of 55 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
koanf.go	Updated core type definitions and method signatures from interface{} to any
interfaces.go	Updated Provider and Parser interface signatures
options.go	Updated merge function signature
getters.go	Updated type assertions from interface{} to any
maps/maps.go	Replaced interface{} with any and refactored duplicate functions using generics
parsers/*.go	Updated parser Unmarshal/Marshal signatures across all parsers
providers/*.go	Updated provider Read/Watch method signatures across all providers
tests/*.go	Updated test fixtures and type declarations
examples/*.go	Updated callback signatures in example code
README.md	Updated documentation references

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[rhnvrm]

Looks good 👍