Backport of acl: fix a bug in token creation when parsing expiration TTLs. into release/1.4.x #16005
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Backport
This PR is auto-generated from #15999 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
The ACL token decoding was not correctly handling time duration
syntax such as "1h" which forced people to use the nanosecond
representation via the HTTP API.
The change adds an unmarshal function which allows this syntax to
be used, along with other styles correctly.
It also includes a docs clarification on the validation params used for
TTL values.
closes #15960