fix(exchange): change pallet errors

[nasqn]

Description

AssetBalanceLimitExceeded is splitted into two errors, one for sell case and one for buy.

Fixes: #268

Motivation and Context

There was only one error for two different cases and error name itself was not accurate. Two different errors helps to better indicate what's the problem and when it actually occurs.

How Has This Been Tested?

Run tests locally, fixed the broken one.

Checklist:

• [ v ] I have updated the documentation if necessary.
• I have added tests to cover my changes, regression test if fixing an issue.
• [v ] This is a breaking change.

[nasqn]

This issue looked very simple, but when it's about namings of public interfaces - you should understand all code around it pretty well to give good names.

I was trying to figure out how exchange pallete works, but it's not too easy :) so I'm not sure that I've solved the issue correctly.

[nasqn]

Also I don't know is changing of errors a breaking change?

[enthusiastmartin]

This looks ok , except the new IncorrectMatch error.

However, there is a bug in this area #274 ( fix coming soon ) which will likely to make some changes in this area.

So, let's first fix that bug and then make changes in this PR.

[unordered-set]

Also I don't know is changing of errors a breaking change?

Yes, it is. Ui has some expectations about error names to display valid translations etc. One you change it, fronted needs to be updated accordingly. So you also need to update the palette version

[jak-pan]

Also I don't know is changing of errors a breaking change?

Yes, it is. Ui has some expectations about error names to display valid translations etc. One you change it, fronted needs to be updated accordingly. So you also need to update the palette version

Actually, UI shows errors based on /// documentation for error it gets from the node. But it's indeed a breaking change since the deposited events need to be deserialized differently now and that means we need to increase pallet version and also spec_version and runtime version.