Function that takes creates a signature for the values
using a secret.
Examples
build_token(values = list(list(1, 2, 3), 2, 2, 3, "bb"))
#> [1] "99f110fffdfcbd97e98013a44f0eb0696f7b889699d8a1ee342ab6312e391652"
build_token(values = list(list(1, 2, 3), 1, 2, 3, "bb"))
#> [1] "2d28d1fa15dd69df1e922fbddf01c0991d6bdb10ac408a5fcb5f14f6b52229a1"
build_token(values = list(list(1, 2, 3), 1, 2, 3, "bb"), secret = "abc")
#> [1] "96425c9eceb7304f78a1b281252d3410634313e703d386b09776351ef974b292"
build_token(values = list(list(1, 2, 3), 1, 2, 3, "bb"), secret = "abd")
#> [1] "f26e6db10cc6dba5bfdc101bd3b9ce12d06bf109e148b2a4460807f1275dafcc"