missing lazy functions

[sorhawell]

the following functions py-polars/polars/functions/lazy.py are not yet translated in ./R/functions__lazy.R (file renamed in #196).

tag any merged translated, or write your name after to reserve it for a PR

• [x] pl$map
• [x] pl$apply
• [x] pl$fold (#403)
• [x] pl$reduce (#403)
• [ ] pl$cum_fold
• [ ] pl$cum_reduce
• [x] pl$exclude
• [ ] pl$groups (maybe wait for https://github.com/pola-rs/polars/issues/13274)
• [ ] pl$format
• [x] pl$cumsum
• [x] pl$any
• [x] pl$all cover bitwise also
• [x] pl$quantile
• [x] pl$arange
• [x] pl$collect_all => @etiennebacher: I don't think we need to implement this, it's basically lapply(<list of LF>, \(x) x$collect())
• [ ] pl$repeat
• [x] pl$arg_where
• [x] pl$spearman_rank_corr --- Deprecated in pypolars
• [x] pl$pearson_corr --- Deprecated in pypolars
• [x] pl$corr (#351)
• [x] pl$cov (#351)
• [x] pl$arg_sort_by
• [x] pl$duration
• [x] pl$datetime_
• [x] pl$date_
• [x] pl$concat_str_ (#349)
• [x] pl$from_epoch (#708)
• [x] pl$rolling_cov (#351)
• [x] pl$rolling_corr (#351)