Rent should only be collected per block (not per transaction)

[jstarry]

Problem

Rent is a protocol thing that happens to accounts outside of transactions but currently is closely tied to account creation transactions. This is an issue for a few reasons:

1. Accounts could be charged rent more than once per block (if created / destroyed / created again)
2. Rent affects the postBalance field in stored transaction status metadata and this effect is not currently transparent to clients (see: https://github.com/solana-labs/explorer/issues/118)
3. Tying rent collection to transactions is inconsistent with how eager rent collection works (per block)

Proposed Solution

Instead of collecting rent during each transaction which creates accounts, wait to collect rent from newly created accounts until the end of a block.

[sakridge]

The end-of-block rent only collects for a subset of account keys, so you could rotate your key in a way to avoid the rent. Thus both mechanisms are needed.

[jstarry]

@sakridge I just updated the description to say "Collect rent from newly created accounts". Does that address your comment?

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EDIT: Updated the description again for clarity

[jstarry]

It's a separate mechanism from eager rent collection

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