refactor(rust): add LazyFileListReader trait

[mslapek]

The new trait LazyFileListReader deduplicates glob logic in the polars-lazy crate.

It makes much easier to add glob support to other formats, see ndjson #6638 issue.

Breaking changes

NO breaking changes are intended in this PR.

I've assumed that _impl methods are not part of the public API (if that's not the case, it's trivial to fix).

Some glob error messages are streamlined among file formats.

API philosophical discussion

There is a small inconsistency in polars-lazy, i.e. there are 2 reader conventions:

1. Struct WITHOUT path, named Scan
2. Struct WITH path, named Reader

I've chosen (arbitrarily) the second one for the design of the trait... 🤔

The first one might be potentially more elegant with factory metaphor:

scan.finish(Path) -> LazyFrame

[mslapek]

CI breaks in the same place as the merged PR #6940 (which on master passes tests).

That's surprising... 🤨 Maybe CI must be somehow reconfigured?

[ritchie46]

A rebase should work.

[ritchie46]

Thanks @mslapek looks good. I have one small nit for the file name and then it is good to go.