rcc

feat: New `tbl_nrow()` to support lazy data frames #2717

Job	Run time
Smoke test: stock R	3m 49s
Check matrix	6s
rcc: ${{ matrix.os }} (${{ matrix.r }}) ${{ matrix.desc }}	0s
Without bit64	1m 51s
Without DBI	1m 51s
Without debugme	1m 56s
Without DiagrammeR	1m 55s
Without dplyr	1m 56s
Without formattable	1m 56s
Without ggplot2	1m 53s
Without lubridate	1m 50s
Without nanotime	1m 59s
Without nycflights13	2m 1s
Without palmerpenguins	1m 46s
Without scales	1m 48s
Without stringi	1m 43s
Without tibble	1m 6s
Without units	1m 57s
Without vdiffr	1m 54s
	33m 17s

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