Merge branch 'net-ipv6-ioam6-introduce-tunsrc'

Justin Iurman says:

====================
net: ipv6: ioam6: introduce tunsrc

This series introduces a new feature called "tunsrc" (just like seg6
already does).

v3:
- address Jakub's comments

v2:
- add links to performance result figures (see patch#2 description)
- move the ipv6_addr_any() check out of the datapath
====================

Link: https://patch.msgid.link/20240817131818.11834-1-justin.iurman@uliege.be
Signed-off-by: Paolo Abeni <pabeni@redhat.com>