Add sniffer cleanup API's

[lealem47]

Description

• Expose RemoveStaleSessions sniffer API so that users can remove sessions that have timed-out. Currently, this function only gets called when the number of sessions reaches a certain number
• Add ssl_RemoveSession() function. Allows users to remove/free specific TLS sessions using client/server IP & ports

Fixes zd#19853

Testing

./configure --enable-sniffer && make

Tested the new ssl_RemoveSession API with the snifftest and the patch below:

diff --git a/sslSniffer/sslSnifferTest/snifftest.c b/sslSniffer/sslSnifferTest/snifftest.c
index 8eb25affa..e1864e007 100644
--- a/sslSniffer/sslSnifferTest/snifftest.c
+++ b/sslSniffer/sslSnifferTest/snifftest.c
@@ -1360,6 +1360,9 @@ int main(int argc, char** argv)
              * bad packet was encountered */
             hadBadPacket = DecodePacket((byte*)packet, header->caplen,
                                         packetNumber,err);
+
+            if(packetNumber == 6)
+                ssl_RemoveSession("127.0.0.1",49275,"127.0.0.1",11111,err);
 #endif
         }
         /* check if we are done reading file */

And made sure the session was getting removed as expected:

./sslSniffer/sslSnifferTest/snifftest -pcap ./scripts/sniffer-tls13-ecc.pcap -key ./certs/statickeys/ecc-secp256r1.pem -server 127.0.0.1 -port 11111
snifftest 5.8.0
sniffer features: key_callback tls_v13 tls_v12 static_ephemeral sni extended_master rsa dh ecc rsa_static dh_static 

Using packet filter: (ip6 or ip) and tcp and port 11111
ssl_Decode ret = -1, Session Not Found on packet number 7
ssl_Decode ret = -1, Session Not Found on packet number 9
ssl_Decode ret = -1, Session Not Found on packet number 11
ssl_Decode ret = -1, Session Not Found on packet number 13
ssl_Decode ret = -1, Session Not Found on packet number 15
ssl_Decode ret = -1, Session Not Found on packet number 17
ssl_Decode ret = -1, Session Not Found on packet number 19
ssl_Decode ret = -1, Session Not Found on packet number 21
ssl_Decode ret = -1, Session Not Found on packet number 22
ssl_Decode ret = -1, Session Not Found on packet number 25
ssl_Decode ret = -1, Session Not Found on packet number 27
ssl_Decode ret = -1, Session Not Found on packet number 28
ssl_Decode ret = -1, Session Not Found on packet number 33
SSL App Data(60:14):hello wolfssl!
SSL App Data(62:22):I hear you fa shizzle!
SSL App Data(94:14):hello wolfssl!

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[lealem47]

Jenkins retest this please