refactor: use a more modern writing style to simplify code

[joemicky]

Optimize code using a more modern writing style. Official support from Go, for more details visit https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize.

Seem as lightninglabs/aperture#188

[gemini-code-assist]

Summary of Changes

Hello @joemicky, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors existing Go code to align with more modern Go writing styles and best practices, as recommended by tools like "gopls/internal/analysis/modernize". The changes primarily focus on simplifying loop variable declarations, optimizing numerical comparisons, and updating string/byte slice manipulations for improved readability and conciseness.

Highlights

• Loop Variable Simplification: Eliminated redundant variable re-declarations within "for...range" loops across multiple files, leveraging Go's modern loop semantics.
• Numerical Calculation Optimization: Replaced verbose "if" conditions with the more concise "max()" function for determining maximum values in amount and fee calculations.
• String and Byte Slice Formatting: Updated "caveatPrefix" initialization to use "fmt.Appendf" for more efficient and idiomatic byte slice formatting.
• Map Copying Modernization: Introduced the "maps.Copy" function for a cleaner and more direct way to copy map contents.

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[gemini-code-assist]

Code Review

This pull request introduces a series of refactorings to modernize the Go codebase, aligning it with current best practices and language features. The changes include removing redundant variable shadowing in loops, which is no longer necessary since Go 1.22, and replacing conditional logic with the max() built-in function where applicable. Additionally, the code now leverages fmt.Appendf and maps.Copy for improved performance and readability. All changes are correct and represent a positive improvement to the codebase's quality and maintainability. I have no further suggestions.