formula: change some private API to public API

[cho-m]

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The following methods used in Homebrew/core are now public API:

• system
• std_*_args
• any_version_installed?
• shared_library
• rpath
• loader_path
• deuniversalize_machos
• generate_completions_from_executable

Also remove duplicate typing in generate_completions_from_executable

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Otherwise, https://rubydoc.brew.sh/Formula.html shows

This method may only be used in the Homebrew/brew repository

even though we use it in Homebrew/core.

[cho-m]

Though, may need to also flip Formula to be @api public since it is odd that we claim

This class is part of a private API. This class may only be used in the Homebrew/brew repository.

[Bo98]

Methods that are used in Homebrew/core should at least be internal API. This updates:

• any_version_installed?
• shared_library
• rpath
• loader_path
• deuniversalize_machos
• generate_completions_from_executable

These should all be public. It should be rare/never that Homebrew/core uses internal API, especially given brew extract exists. I don't think any of these are particularly obscure.

[MikeMcQuaid]

Makes sense, thanks!

[MikeMcQuaid]

Though, may need to also flip Formula to be @api public since it is odd that we claim

This class is part of a private API. This class may only be used in the Homebrew/brew repository.

I think as long as all private methods show up as private if we make this @api public: yeh, I agree.

[cho-m]

These should all be public. It should be rare/never that Homebrew/core uses internal API, especially given brew extract exists. I don't think any of these are particularly obscure.

Was playing it safe, but can make them public.

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I think as long as all private methods show up as private if we make this @api public: yeh, I agree.

This was the main reason I didn't in this PR. Wasn't sure if we needed to mark everything as @api private afterward.

[MikeMcQuaid]

Was playing it safe, but can make them public.

go for it 👍🏻

This was the main reason I didn't in this PR. Wasn't sure if we needed to mark everything as @api private afterward.

I think @reitermarkus changed this in the past? Can probably check a method not explicitly marked like this and see what it looks like on <rubydoc.brew.sh>