SIMD-0084: Disable rent fees collection (#84)

* add simd

* reviews

* add tracking feature

* Update proposals/0084-disable-rent-fees-collection.md

Co-authored-by: lheeger-jump <[email protected]>

* Update proposals/0084-disable-rent-fees-collection.md

Co-authored-by: lheeger-jump <[email protected]>

* reviews

* remove link to implementation PR

* Apply suggestions from code review

Co-authored-by: Brooks <[email protected]>

* update motivation and impact sections

* Update proposals/0084-disable-rent-fees-collection.md

Co-authored-by: Brooks <[email protected]>

* Update proposals/0084-disable-rent-fees-collection.md

Co-authored-by: Brooks <[email protected]>

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Co-authored-by: lheeger-jump <[email protected]>
Co-authored-by: Brooks <[email protected]>

proposals/0084-disable-rent-fees-collection.md

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+---
+simd: '0084'
+title: Disable rent fees collection
+authors:
+  - Haoran Yi
+category: Standard
+type: Core
+status: Draft
+created: 2023-11-03
+feature: https://github.com/solana-labs/solana/issues/33946
+---
+
+## Summary
+
+Add a new feature to disable rent fees collections.
+
+## Motivation
+
+On solana network, (Rent) [https://solana.com/docs/intro/rent] was introduced to
+account for the storage costs of an account initially. However, as the disks
+become cheaper and cheaper. The cost of storing the account becomes negligible.
+
+Furthermore, today it is no longer possible to create any new rent-paying
+accounts on the network. Any attempt to create a rent-paying accounts will
+result a transaction error. The total number of rent-paying accounts on solana
+network is phasing out. Therefore, when all the rent-paying accounts are gone in
+the network, we would like to disable rent fee collection on the network
+completely through a feature.
+
+
+## Alternatives Considered
+
+None
+
+## New Terminology
+
+None
+
+## Detailed Design
+
+When the feature "disable rent fees collections" is activated, rent will no
+longer be collected from accounts, nor will the collected rent fees be
+distributed to validators.
+
+Note that this does **not** change the requirement that existing rent-paying
+accounts need to be made rent-exempt first, before any withdrawals can be
+made, should there be any such rent-paying accounts.
+
+## Impact
+
+The main impact of this SIMD is to simply the validator design. Rent collection
+code is a non-trivial piece of code inside the bank. By removing it, we simply
+the overall code of bank, and we no longer need to maintain it in existing
+validator client code. This will also help to simplify the development of other
+validator client implementations, which don't need to replicate the rent
+collection logic.
+
+
+## Security Considerations
+
+There will be no more rent-paying accounts before this feature is activated. It
+is already impossible to create any new rent-paying accounts on the network,
+there should be no security issues. However, if for some reason rent-paying
+accounts still exist or are created in the network, when the feature is
+activated, the network will still work as expected. The only difference is that
+rent fees will no longer be collected or distributed.
+
+
+## Backwards Compatibility
+
+Incompatible.