refactor: refactor the Volcano execution engine to avoid using RefCell

[KKould]

What problem does this PR solve?

RefCell removes the transaction encapsulation, reduces runtime overhead and improves code readability, and turns the input of the operator into a plan, making Explain easier to implement.

Code changes

• Has Rust code change
• Has CI related scripts change

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Note for reviewer