MsgConnOpenTry builder and CLI

[ancazamfir]

Closes: #358

Description

• new the raw tx conn-try CLI
• version handling, validation, (de)serialization)
• merkle proof (de)serialization
• basic functions to create the ConnTry message that can be used with minimal changes from the relayer
• changed ConnInit and the client messages builders to allow usage from the relayer
• add proven_.. queries that return proofs
• changed some queries to use ICSHeight instead of tendermint defined Height

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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.

[adizere]

This is great stuff!

Left a few comments, and also ideas to potentially fix later.

[codecov-io]

Codecov Report

Merging #388 (d0d5779) into master (b1b37f5) will increase coverage by 21.5%.
The diff coverage is 64.7%.

@@            Coverage Diff            @@
##           master    informalsystems/hermes#388      +/-   ##
=========================================
+ Coverage    13.6%   35.1%   +21.5%     
=========================================
  Files          69     150      +81     
  Lines        3752    9251    +5499     
  Branches     1374    3318    +1944     
=========================================
+ Hits          513    3254    +2741     
- Misses       2618    5771    +3153     
+ Partials      621     226     -395     

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/packet.rs	0.0% <0.0%> (ø)
modules/src/ics04_channel/msgs/timeout.rs	0.0% <0.0%> (ø)
modules/src/ics04_channel/packet.rs	0.0% <0.0%> (ø)
... and 277 more

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[adizere]

Following the recent PR , there may be major conflicts in file modules/src/ics04_channel/msgs.rs, preventing the merge. From what I can tell, the modifications here are no longer relevant, so it's safe to choose the quick fix of leaving this file as it is on the master currently: https://github.com/informalsystems/ibc-rs/blob/master/modules/src/ics04_channel/msgs.rs (choose merging strategy theirs I think).

PS: The changes here are small: basically you're removing any use of the ICS03::validate_version method from what I can tell, and I'm doing the same changes in #391, so we will not lose these fixes.