Channel open handshake message relaying/CLIs

[ancazamfir]

Closes: #371 #372 #373 #374

Description

• CLIs for channel open handshake messages
• building and relaying of channel open handshake messages

[will revert the Cargo.toml changes for tendermint dependencies after more testing]

---

For contributor use:

• Updated the Unreleased section of CHANGELOG.md with the issue.
• If applicable: Unit tests written, added test to CI.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments.
• Re-reviewed Files changed in the Github PR explorer.

[codecov-io]

Codecov Report

Merging #403 (6ed24df) into master (b1b37f5) will increase coverage by 19.7%.
The diff coverage is 66.0%.

@@            Coverage Diff            @@
##           master    #403      +/-   ##
=========================================
+ Coverage    13.6%   33.4%   +19.7%     
=========================================
  Files          69     154      +85     
  Lines        3752   10296    +6544     
  Branches     1374    3780    +2406     
=========================================
+ Hits          513    3442    +2929     
- Misses       2618    6245    +3627     
+ Partials      621     609      -12     

Impacted Files	Coverage Δ
modules/src/events.rs	0.0% <0.0%> (ø)
modules/src/ics02_client/events.rs	0.0% <ø> (ø)
modules/src/ics02_client/msgs.rs	0.0% <0.0%> (ø)
modules/src/ics02_client/raw.rs	0.0% <0.0%> (ø)
modules/src/ics03_connection/error.rs	13.6% <0.0%> (-19.7%)	⬇️
modules/src/ics04_channel/error.rs	75.0% <ø> (+50.0%)	⬆️
modules/src/ics04_channel/msgs/acknowledgement.rs	0.0% <0.0%> (ø)
modules/src/ics04_channel/msgs/chan_open_try.rs	66.8% <ø> (ø)
modules/src/ics04_channel/msgs/recv_packet.rs	0.0% <ø> (ø)
modules/src/ics04_channel/msgs/timeout.rs	0.0% <ø> (ø)
... and 286 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b641f79...6ed24df. Read the comment docs.

[adizere]

The present version seems to have compilation issues, following recent changes in tendermint-rs master (domaintype redefined to protobuf). So we should remember to revert cargo modifications, or adapt to these changes.

Otherwise looks good IMO!