planner: automatically mark invalid bindings

## Feature Request

**Is your feature request related to a problem? Please describe:**

Bindings might become invalid due to schema changes, for users with massive bindings, we should be able to help them mark invalid bindings automatically:

**Describe the feature you'd like:**

Add a new column like `valid` in `mysql.bind_info` to indicate whether this binding is valid or not.

For users, they can more easily delete these invalid bindings.

**Describe alternatives you've considered:**

**Teachability, Documentation, Adoption, Migration Strategy:**