proto-compiler: Make ibc-go repo optional

[adizere]

Closes #809
Changes in this PR:

• made the parameters --ibc-go-commit (for clone command) and --ibc (for compile command) optional
• regenerated the Rust files for IBC from the SDK .proto files (ignoring the IBC go repo)

Description

---

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.

[ancazamfir]

Tried to run dev-env:

$ cargo build -q
error: couldn't read proto/src/prost/COSMOS_IBC_COMMIT: No such file or directory (os error 2)
  --> proto/src/lib.rs:13:38
   |
13 | pub const COSMOS_IBC_VERSION: &str = include_str!("prost/COSMOS_IBC_COMMIT");
   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

error: could not compile `ibc-proto`

To learn more, run the command again with --verbose.
ancas-mbp:ibc-rs ancaz$

[codecov-io]

Codecov Report

Merging #808 (9513ede) into master (b1b37f5) will increase coverage by 31.3%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #808      +/-   ##
=========================================
+ Coverage    13.6%   45.0%   +31.3%     
=========================================
  Files          69     164      +95     
  Lines        3752   11299    +7547     
  Branches     1374       0    -1374     
=========================================
+ Hits          513    5090    +4577     
- Misses       2618    6209    +3591     
+ Partials      621       0     -621     

Impacted Files	Coverage Δ
...application/ics20_fungible_token_transfer/error.rs	0.0% <ø> (ø)
...ion/ics20_fungible_token_transfer/msgs/transfer.rs	22.2% <ø> (ø)
..._transfer/relay_application_logic/send_transfer.rs	85.7% <ø> (ø)
modules/src/events.rs	0.0% <ø> (ø)
modules/src/handler.rs	100.0% <ø> (ø)
modules/src/ics02_client/client_consensus.rs	55.8% <ø> (ø)
modules/src/ics02_client/client_def.rs	32.3% <ø> (ø)
modules/src/ics02_client/client_state.rs	65.1% <ø> (ø)
modules/src/ics02_client/client_type.rs	79.1% <ø> (+31.5%)	⬆️
modules/src/ics02_client/context.rs	90.4% <ø> (ø)
... and 251 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 1c72c28...9513ede. Read the comment docs.