fix(iro): removed ibc filter for VFC creation

[mtsitrin]

Description

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Closes #XXX

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• Import/Export Genesis
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• UInt to byte conversion should use BigEndian

Full security checklist here

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[VictorTrustyDev]

@mtsitrin does the iro tokens has a prefix?
How about just accept whitelisted prefix like ibc/ and iro/ prefixes instead of allow all?
That would help us get rid of unwanted cases.

[mtsitrin]

@mtsitrin does the iro tokens has a prefix? How about just accept whitelisted prefix like ibc/ and iro/ prefixes instead of allow all? That would help us get rid of unwanted cases.

we currently trigger the VFC creation explicitly through x/denommetadata module
so I think it's already filters out unwanted cases
currently, its can be triggered by gov proposal, ibc middleware with rollapps, and IRO