Adds tests for when the connection fails during
1) splice tx_signature
2) splice commitment_signed
Fleshed out the reestablish flow for these two cases and implemented the fixes to make these reestablish flows work.
Part of this work required changing commit process for splices: Now we send a single commit_part for the splice where previously we sent all commits, and accordingly, we no longer revoke in response.
Changelog-Fixed: Implemented splicing restart logic for tx_signature and commitment_signed. Splice commitments are reworked in a manner incompatible with the last version.
Since it's only for transitory splicing info, the new name makes sense.
```
cc channeld/channeld.c
In file included from channeld/channeld.c:23:
./channeld/splice.h:37:8: error: redefinition of 'splice'
struct splice {
^
/usr/include/sys/socket.h:140:8: note: previous definition is here
struct splice {
^
```
Reported-by: @grubles
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Fixes: #6486
Update the lightningd <-> channeld interface with lots of new commands to needed to facilitate spicing.
Implement the channeld splicing protocol leveraging the interactivetx protocol.
Implement lightningd’s channel_control to support channeld in its splicing efforts.
Changelog-Added: Added the features to enable splicing & resizing of active channels.
Dusty Daemon
Rusty Russell