[Tech]: Borrow tax for each vault

[AndreyKortosov]

Problem statement

Right now we have a common borrow tax for all vaults of Kensetsu. To effectively manage the borrow tax for each vault we need to add a borrow tax parameter in pallet Kensetsu to extrinsics creating and updating vaults. And remove extrinsic updateBorrowTax is unnecessary to use.

Description

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Definition of Done

• [ ] Added new parameter borrowTax to pallet Kensetsu to extrinsic create a vault.
• [ ] Added new parameter borrowTax to pallet Kensetsu to extrinsic update a vault.
• [ ] Remove and don't use the extrinsic updateBorrowTax.

Requirements

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