Add Local-Ic Relayer Edge Case Tests for Remote Chain Splitter

[dowlandaiello]

Closes #235 . This PR implements relayer edge case tests in local-interchain for the remote chain splitter. These tests include:

• Happy path test: ensure the remote chain splitter creates an ICA when the relayer is up
• Timeout handling test: ensure the remote chain splitter does not advance when the relayer is down (causing a packet timeout)
• Recovery test: ensure the remote chain splitter can continue after a timed out packet to create the ICA when the relayer is restored

Failing Tests

Some local-ic tests are not currently working (namely the two party osmo pol test). However, all of the remote chain splitter tests are working. Fixing the two party osmo pol test is not within the scope of this PR, so I did not fix them.

Overview on Changes / Additions

• local-interchaintest/Cargo.toml - Added the remote chain splitter as a dependency to local-ic so that it can be tested
• Cargo.lock - See above about Cargo.toml
• local-interchaintest/src/main.rs - Added the remote chain splitter tests as tests run by local-ictest-e2e
• local-interchaintest/src/tests/mod.rs, local-interchaintest/src/tests/remote_chain_splitter/mod.rs - Self explanatory
• local-interchaintest/src/tests/remote_chain_splitter/remote_chain_splitter.rs - See above on the 3 tests I added. Of note: two functions in this file, start_relayer and stop_relayer may be useful in other local-ic relayer tests, so moving them to a utils file could be prudent to prevent test dependencies across tests.

Macro Usage

There is a very short macro in remote_chain_splitter.rs. I can remove it if necessary. The macro just consolidates some redundant timeout checking logic in a way that allows breaking from the timeout check on successful ICA creation, which would be slightly more convoluted with a function. IMO, it's short and relatively useful, but not necessary, so it can be removed if desired.

[keyleu]

LGTM