FilterExec's fetch not impl the ser/de in protobuf

[haohuaijin]

Describe the bug

see releated code

datafusion/datafusion/proto/proto/datafusion.proto

Lines 1031 to 1037 in b3976d6

	message FilterExecNode {
	PhysicalPlanNode input = 1;
	PhysicalExprNode expr = 2;
	uint32 default_filter_selectivity = 3;
	repeated uint32 projection = 9;
	uint32 batch_size = 10;
	}

and

datafusion/datafusion/physical-plan/src/filter.rs

Lines 79 to 96 in b3976d6

	pub struct FilterExec {
	/// The expression to filter on. This expression must evaluate to a boolean value.
	predicate: Arc<dyn PhysicalExpr>,
	/// The input plan
	input: Arc<dyn ExecutionPlan>,
	/// Execution metrics
	metrics: ExecutionPlanMetricsSet,
	/// Selectivity for statistics. 0 = no rows, 100 = all rows
	default_selectivity: u8,
	/// Properties equivalence properties, partitioning, etc.
	cache: Arc<PlanProperties>,
	/// The projection indices of the columns in the output schema of join
	projection: Option<ProjectionRef>,
	/// Target batch size for output batches
	batch_size: usize,
	/// Number of rows to fetch
	fetch: Option<usize>,
	}

To Reproduce

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Expected behavior

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Additional context

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[haohuaijin]

take