Refactoring for kip103

[yoomee1313]

Proposed changes

• This PR is a refactoring for kip103.

Types of changes

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• Bugfix
• New feature or enhancement
• Others

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• I have added tests that prove my fix is effective or that my feature works
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Further comments

Referenced dev...blukat29:klaytn:module-bc-system.

[blukat29]

It has to be rebased after #2127.

[blukat29]

@yoomee1313 #2127 merged. Rebase please and sorry for the large changeset.

[yoomee1313]

This PR has been rebased. Please take a look. @blukat29 @ian0371 @hyeonLewis @hyunsooda

[blukat29]

1. Perhaps you didn't modify contracts/contracts/testing/system_contracts/all.sol?
2. Do you intend to keep kip103 and upcoming kip160 contracts into contracts/contracts/system_contracts/rebalance altogether? If so, I am okay with the file relocation in this PR.

[yoomee1313]

Perhaps you didn't modify contracts/contracts/testing/system_contracts/all.sol?

I missed it. Added the import statement of TreasuryRebalanceMock.sol at all.sol.

Do you intend to keep kip103 and upcoming kip160 contracts into contracts/contracts/system_contracts/rebalance altogether? If so, I am okay with the file relocation in this PR

Correct. I'm planning to put kip103,kip160 contracts altogether in rebalance folder.

[blukat29]

Thanks!