punycode: add unit tests

These tests verify basic functionality and specifically test for
CVE-2022-3602.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz

punycode: add unit tests

These tests verify basic functionality and specifically test for
CVE-2022-3602.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(cherry picked from commit f0f530216bf93e9cdc9c2c9e3c095229d216da15)

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