Implement lazyframe profiling and optimization toggles

[Sicheng-Pan]

#261

[sorhawell]

we are missing a unit test. py-polars do not always unit test this either. We need to extract the curret settings from a LazyFrame / logicalplan. I have previous found bugs in rust-polars by testing such optimization settings.

[sorhawell]

@Sicheng-Pan I'm ok with merging this PR now.

I think you mentioned you wanted to allow both the setting opt-toggles via collect as in py-polars, but that it also makes sense to se individually as in rust-polars. I'm agree with that, if you want to add that back in.

we can just postpone the unit tests until #324 has been merged

[sorhawell]

This PR is needed for #343 due to opt-toogles + polars CSE feature + robj_to!(i32, robj)

@Sicheng-Pan
Also I realized that profile and fetch do collect like collect , but each of this functions need individual support for R_function. If using the plain rust .profile() or .fetch() method then R fn .map() is not supported.

Refactored and added two internal functions collect_with_r_func_support and collect_with_r_func_support. It should be easy to later also add fetch_with_r_func_support

[etiennebacher]

I could only review the R part, need someone else for the Rust part

[sorhawell]

@etiennebacher @eitsupi I think this PR is ready to go. It is needed for the Sink PR #343

[etiennebacher]

I just did minor doc changes. @sorhawell since you and @Sicheng-Pan have worked on the Rust part I guess it's already reviewed.

I'm just waiting the CI to pass before merging, thank you both!