update Confidential MPT spec

[PeterChen13579]

High Level Overview of Change

Context of Change

Update the spec for the following:

• lsmfMPTCanMutateCanLock default is false. If we want to enable freeze and clawback of confidential funds, issuer need to set this to true when initializing MPT

Clawback burns the funds as opposed to back to issuer’s reserve

Document transfer fees for confidnetial transfers

Holders cannot delete MPT even if his confidential balance is 0

Encrypt canonical 0 will show public balance of 0 so validators can validate it

Update [xls-94] to return tem_invalid_Flag as opposed to malformed for the line: Setting and clearing the same flag simultaneously, e.g., specifying both tmfMPTSetCanLock and tmfMPTClearCanLock

Specify delegate account should be fully trusted.

Type of Change

• New XLS Draft
• XLS Update (changes to an existing XLS)
• XLS Status Change (e.g., Draft → Final, Draft → Stagnant)
• Process/Meta (changes to CONTRIBUTING.md, XLS-1, templates, etc.)
• Infrastructure (CI, workflows, scripts, website)
• Documentation (README updates, typo fixes)

[yinyiqian1]

approve with a minor comment