This PR optimizes permissions calculation for block references, by
calculating them only once per block reference config, instead of once
every single time the blocks are referenced.
This will lead to significant performance improvements in Payload
Configs with a lot of duplicative block references, as permissions are
calculated every time you navigate from page to page.
# Benchmarks
Tested using `pnpm dev benchmark-blocks`.
## Before - ~ 6 seconds
https://github.com/user-attachments/assets/85cac698-3120-414f-91d3-608a404a3a5f
## After - ~ 2 seconds
https://github.com/user-attachments/assets/0c3642f6-6001-41ae-a7cd-f30b24362e9b
313ff047df