optimize type PVData in particle system

[PPpro]

In the implementation of the current particle system, the type of pvdata is very wierd. It is an array, but the type of the array element is uncertain, like below:

cocos-engine/cocos/particle/renderer/particle-system-renderer-cpu.ts

Lines 140 to 142 in 83a93c4

	// TODO: we should not use this type, should use a uniform array type instead.
	// Tracking issue: https://github.com/cocos/cocos-engine/issues/15553
	export type PVData = [Vec3, Vec3, Vec3, Vec3, number, Vec3 | null, null];

it's not good for type system and AOT optimization, we should take a time to optimize this property type of _attrs

cocos-engine/cocos/particle/renderer/particle-system-renderer-cpu.ts

Line 151 in 83a93c4

private _attrs: PVData;

issue from PR: #15527