Add minimum transfer amount to transporting to different chain through XDM

[vedhavyas]

Currently we allow as little as 1 unit to transfer from one chain to another through XDM. As seen in taurus, anyone scripter with even small amount of balance can occupy a full channel and opening a new channel is costly.

With a minimum transfer, this could be alleviated and allow fair and actual usage of XDM.
Currently set it as 10 AI3 but this can be played around as well.

Thoughts on the 10 Ai3 being less or more @jfrank-summit @jim-counter ?

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[jfrank-summit]

@jim-counter will likely have a stronger opinion here, but 10 seems to high. On mainnet it will take small farmers a significant amount of time to earn 10 AI3, leaving them unable to transfer from Consensus. I don't know what the value should be, but 1 AI3 seems more reasonable. When transferring isn't incentivized, there is little incentive for users to burn fees transferring small amounts of actual (versus test) AI3.

[vedhavyas]

1 AI3 is reasonable to me but having such a min transfer is does avoid channel blockages if some does try to fill up the channel.

I dont mind not including this yet but would be nice to have this than later

[jim-counter]

Agree with 1 AI3 as a starting position. We are upping the limit from the current 1 Shannon and can always tune this based on real-world usage observation.

[NingLin-P]

The changes LGTM, please update MinimumTransfer if we decided to go with 1 AI3

[vedhavyas]

Looks like there is issue with latest main. Will look into it later and push a fix

[jfrank-summit]

LGTM