Feature request: add ability to generate CMake `<cdylibname>-config.cmake` for `find_package(<cdylibname>)`

[leha-bot]

It could be managed by Cargo.toml via [package.metadata.capi.cmake]. Potential customization points are similar as pkg-config, plus:

• target_name - how cargo-c will name the target (in the pattern `::<target_name>, default value is the same as )
• template_filename - the cmake script for overriding the default template for <cdylibname>-config.cmake. It must support placeholders like pkg-config does and cmake does itself

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This descriprion would be refined if there is an interest for this feature , if you won't mind, I'll try to make a PR.

Thanks for bridging the safe crates world and another projects with ffi 😅

[lu-zero]

I welcome PRs, but I have only moderate knowledge of cmake so we'd need a few tests to confirm. Still I wish cmake would just have its pkg-config implementation instead of reinventing 3 wheels...