Initial / start of implementation

[ldemailly]

• basic structure
• fix issue with leading whitespace in (split) comments
• handle in place changes (rename original to .bak) as well as gofumpt
• better/smart (word) cut for comments
• handle /* and not just //
• issue with disappearing new line before function after */ (see make test) go/ast,go/format: newline missing between modified comment and function golang/go#66439
• handle comments not just at top level
• handle string literals (which is most of the issues in Use shared workflows fortio/slack-proxy#49)
• handle that a literal or comment maybe below the -len yet making a line in total > len (because of right indentation)
• cut more lines like function signatures

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[ldemailly]

will merge this as a good enough starting point and make follow up issues