Move Suggest-ed package tests out of tests.Rraw

[mattdowle]

To reduce RAM usage in attempt to work on (I guess severely overloaded) CRAN Windows #5507
Thanks to a comment by @ben-schwen here: #5515 (comment)

[mattdowle]

bit64 tends to be tagged onto sets of type tests, so that will be tricky to move out. There is a lot of usage too (52). Loading it uses 15MB so let's leave bit64 for now.

x = system("grep -o 'if [(]test_[^)]*[)]' inst/tests/tests.Rraw", intern=TRUE)
as.matrix(sort(table(x)))
                                [,1]
if (test_bit64 && test_R.utils)    1
if (test_yaml)                     1
if (test_xts)                      4
if (test_longdouble)               5
if (test_nanotime)                 6
if (test_R.utils)                 28
if (test_bit64)                   52

# fresh R
rss = function()as.integer(as.numeric(system(paste0("ps -o rss --no-headers ",Sys.getpid()),intern=TRUE))/1024)
rss()
# 53
require(bit64)
rss()
# 68