ebuild-writing/bundled-dependencies: new section

[thesamesam]

I've tried to faithfully port the wiki page [0] to the devmanual in this commit, and intend to change the contents as required in followups, to allow easier comparison and to retain provenance.

[0] https://wiki.gentoo.org/wiki/Why_not_bundle_dependencies

Closes: https://bugs.gentoo.org/300625

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~Note: I'm looking for review of the formatting and porting to the devmanual for now, not whether we should add/adjust content etc (which I will do once the foundation is OK).~

[thesamesam]

How's it looking now? OK to proceed to content review? And do we want to commit this as-is, or review the content here? Either is fine with me. I guess reviewing the content here is easier because you can comment on the full diff more easily.

What I don't want to do, however, is squash any content fixes into the first commit.

[ulm]

I'd say we should continue with content review here.

[thesamesam]

Let me know when it looks OK and I'll move onto content (I don't want to try fix existing style issues in the first commit once I started that, as cherry-picking that will be hell).

[thesamesam]

Thank you! The quick reviews are appreciated, it helps a lot with momentum and motivation.