[runtime_deploy] Respect subfolders in order to preserve symlinks

[uilianries]

This PR is the second part of changing the runtime_deploy, addressing the comment #16938 (comment).

When having subfolders in the lib or bin package folder, the same the same will be preserved. This situation avoids broken symlinks, for instance, we consume libfoo.so, but it's a symlink and points to subfolber/libfoo.so.1.0.

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Open to discussion:

When doing this fix occurred me the following case:

Users may have problems with LD_LIBRARY_PATH if there are separate libraries in the subfolder. Maybe, we could include a new conf, like tools.deployer.runtime:flatten, when True, we move all artifacts for the top folder, and fix the relative symlinks, for instance:

conan install foo/0.1.0 --deployer=runtime_deploy --deployer-folder=output

# tools.deployer.runtime:flatten=False/None (default)
ls -R output/
libfoo.so -> subfolder/libfoo.so.1
subfolder/libfoo.so.1 -> subfolder/libfoo.so.1.0

# tools.deployer.runtime:flatten=True
ls -l output/
libfoo.so -> libfoo.so.1
libfoo.so.1 -> libfoo.so.1.0

Changelog: Fix: Preserve subfolders for runtime_deploy deployer
Docs: TODO

fixes #16938

Related to #17824

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[memsharded]

Users may have problems with LD_LIBRARY_PATH if there are separate libraries in the subfolder. Maybe, we could include a new conf, like tools.deployer.runtime:flatten, when True, we move all artifacts for the top folder, and fix the relative symlinks, for instance:

Good point. But typically this shouldn't happen? Like they are almost always in the same "bin" directory?

[uilianries]

Good point. But typically this shouldn't happen? Like they are almost always in the same "bin" directory?

True, it's a corner case TBH. Okay, let's keep it simple. People still can open issues in case facing this situation.