feat: support logical plan for EXECUTE statement

[jonahgao]

Which issue does this PR close?

Part of #4539

Rationale for this change

In order to support EXECUTE for prepared statements, we should first support creating logical plans for EXECUTE statements.

The syntax is same to PostgreSQL.

psql=> prepare p(int) as select $1;
PREPARE
psql=> execute p(10);
 ?column?
----------
       10
(1 row)

What changes are included in this PR?

Add a new LogicalPlan

pub struct Execute {
    /// The name of the prepared statement to execute
    pub name: String,
    /// The execute parameters
    pub parameters: Vec<Expr>,
    /// Dummy schema
    pub schema: DFSchemaRef,
}

Are these changes tested?

Yes

Are there any user-facing changes?

Yes

[alamb]

Looks really nice to me -- thank you @jonahgao

[jonahgao]

Thanks for the review @alamb