TSSslSessionID represents the SSL session ID as a buffer and length. The
TS_SSL_MAX_SSL_SESSION_ID_LENGTH is the same value
as the openssl constant
SSL_MAX_SSL_SESSION_ID_LENGTH. The plugin has direct access to this object since creating and
manipulating session IDs seems like a fairly common operation (rather than providing an API to access the data via an
opaque TS object type).
TSSslSession references the SSL session object. It can be cast to the openssl type