force docs on public functions and structs.

[baszalmstra]

All public methods in rattler crates should have proper docs. We can force this with #![warn(missing_docs)] or even #![deny(missing_docs)]. Some crates already have this but we need to play catchup for some of the others.

[baszalmstra]

Crates that still need to be fixed:

• rattler (add documentation to all the crates #268 )
• rattler_conda_types (Docs for all the conda types in crate #79)
• rattler_package_streaming (chore(docs): add deny missing docs to package streaming #64 )
• rattler_virtual_packages (chore(docs): add deny missing docs to virtual packages #63 )

[wolfv]

• rattler_conda_types has been fixed! :)

[wolfv]

I think the only two crates left are rattler and rattler_macros. Both are very much doable.

[wolfv]

fixed by #268