Pull request #3179: Stream splitter c

Pull request #3179: Stream splitter c

Merge in SNORT/snort3 from ~SMINUT/snort3:stream_splitter_c to master

Squashed commit of the following:

commit 2b537e6d3946a89abf9287644d1fb834bff8c4cc
Author: Silviu Minut <sminut@cisco.com>
Date:   Fri Nov 19 14:40:53 2021 -0500

    stream: add PKT_MORE_TO_FLUSH flag and use it in TcpReassembler::scan_data_post_ack() to signal AtomSplitter whether to flush or not

commit 59c24cb2b51268496d5818d4ab27e2929503e6b9
Author: Silviu Minut <sminut@cisco.com>
Date:   Mon Nov 15 14:37:59 2021 -0500

    rpc: remove RpcSplitter altogether and use LogSplitter instead

commit b46a53d6200460ee1de5bd2f7531b729fce63fc6
Author: Silviu Minut <sminut@cisco.com>
Date:   Fri Nov 5 09:21:33 2021 -0400

    stream: fix issue with atom splitter not returning FLUSH

commit 057931ddd0a9a85d4f8316cdb843113e82031774
Author: russ <rucombs@cisco.com>
Date:   Mon Oct 25 08:48:42 2021 -0400

    stream_tcp: remove unnecessary special adjustment methods