Support LogicalPlan::Insert to InsertRequest

[waynexia]

What type of enhancement is this?

Tech debt reduction

What does the enhancement do?

Our logic of processing prepared statement is converting them into LogicalPlan with placeholder. Thus all prepared statement will eventually becomes a logical plan, including INSERT INTO.

But we only support insert with gRPC request and SQL AST. This ticket requests another way that support converting logical plan to insert request

Implementation challenges

No response