Remove or rename ICA 'BindPort' function

[colin-axner]

Summary

It binds the port and claims the capability. InitInterchainAccount does the same functionality without calling that function. It should either be renamed to BindPortAndClaimCapability and used, or removed, or it should only bind to the port

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[colin-axner]

closed by #362

[gjermundgaraba]

This issue was mistakenly reopened during some integration work, so closing again now.