Consistent filtering in Rust client + minor fixes

[RReverser]

Description of Changes

• Extend codegen tests to Rust.
• Fix found issue with non-deterministic order of imports in generated code caused by usage of HashSet.
• Replace cursive-chat's module_bindings folder with a symlink to quickstart-chat's one (as they're supposed to be the same, and this makes diffs smaller).
• Implement Rust client part of Implement consistent filtering rules proposal #1256.
• Regenerated tests.

API and ABI breaking changes

Consistent filtering rules proposal limits types on which filtering can be done, as well as changes filter_by functions to always return an opaque iterator instead of iterator or option as it did before.

Expected complexity level and risk

1

How complicated do you think these changes are? Grade on a scale from 1 to 5,
where 1 is a trivial change, and 5 is a deep-reaching and complex change.

This complexity rating applies not only to the complexity apparent in the diff,
but also to its interactions with existing and future code.

If you answered more than a 2, explain what is complex about the PR,
and what other components it interacts with in potentially concerning ways.

Testing

Describe any testing you've done, and any testing you'd like your reviewers to do,
so that you're confident that all the changes work as expected!

• Ran codegen tests.
• Regenerated all module_bindings in the repo manually.
• Reran SDK tests that depend on module_bindings.

[kazimuth]

Looks good, more consistent. I love reviewing these codegen changes by just looking at changes to the generated code lol.

[RReverser]

I love reviewing these codegen changes by just looking at changes to the generated code lol.

Heh doesn't help that in this case we didn't have baseline codegen snapshot before those changes - that's why I kept the commit introducing that baseline separate.