### Background
We need a way to set an execution quota per user for each block execution.
### Changes 🏗️
* Introduced a `UserBlockCredit`, a transaction table tracking the block usage along with it cost/quota.
* The tracking is toggled by `ENABLE_CREDIT` config, default = false.
* Introduced `BLOCK_COSTS` | `GET /blocks/costs` as a source of information for the cost on each block depending on the input configuration.
Improvements:
* Refactor logging in manager.py to always print a prefix and pass the metadata.
* Make executionStatus on AgentNodeExecution prisma enum. And add executionStatus on AgentGraphExecution.
* Use executionStatus from AgentGraphExecution to improve waiting logic on test_manager.py.
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