length determines the length of a given list, map, or string.
If given a list or map, the result is the number of elements in that collection. If given a string, the result is the number of characters in the string.
> length([])
0
> length(["a", "b"])
2
> length({"a" = "b"})
1
> length("hello")
5
When given a string, the result is the number of characters, rather than the number of bytes or Unicode sequences that form them:
A "character" is a grapheme cluster, as defined by Unicode Standard Annex #29. Note that remote APIs may have a different definition of "character" for the purpose of length limits on string arguments; a Terraform provider is responsible for translating Terraform's string representation into that used by its respective remote system and applying any additional validation rules to it.
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