Make ParachainMinFee managed by XcmInterface pallet

[xlc]

Acala/runtime/karura/src/xcm_config.rs

Lines 291 to 298 in 5a7481c

	pub ParachainMinFee: |location: MultiLocation| -> u128 {
	#[allow(clippy::match_ref_pats)] // false positive
	match (location.parents, location.first_interior()) {
	(1, Some(Parachain(parachains::statemine::ID))) => 4_000_000_000,
	_ => u128::MAX,
	}
	};
	}

this should be managed by XcmInterface pallet so that we can dynamically updating it if needed

Originally posted by @xlc in #1712 (comment)