Configure relayers to watch only channels associated with an individual test #2

[chatton]

Summary

Depends on #6629

In order to be able to run tests in parallel, we need to be able to ensure a relayer in a test is only watching events on a specific channel / test.

In order to do this for hermes, we can configure packet filtering ref.

In our tests, we would need to modify the config file before starting the relayer. The config struct in interchaintest is here

It may need to be updated to have these new fields.

It may be possible instead to perform a raw modification of the bytes of the config file without depending on a struct with this function.

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