[gnutls-devel] GnuTLS | Store extension data alongside session ticket (#1667)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1667



`gnutls_session_get_data*` and `gnutls_session_set_data*` currently only deal with the bare session tickets, meaning that any metadata associated with it (e.g., max_early_data_size) needs to be manually preserved (see !1936). As this is cumbersome and error-prone, maybe we could store the entire [NewSessionTicket](https://www.rfc-editor.org/rfc/rfc8446#section-4.6.1) message instead. A tricky thing is that the format of the NST message is [different](https://www.rfc-editor.org/rfc/rfc5077#section-3.3) in TLS 1.2 and TLS 1.3, maybe we could use TLS 1.3 version as it is more expressive.

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