Make `MaxTimeoutDelta` value configurable via module params

[damiannolan]

Summary

Make the MaxTimeoutDelta for packet sends a configurable on-chain param for the v2 channel submodule.

Right now we define a constant value of 24 hrs. Some teams may want to tweak this to their own liking. We should consider making it configurable. Likely requires some product team research to validate the need for this feature. Opening the issue as a placeholder for now

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[DimitrisJim]

note: if done, don't forget to add params to genesis state.