Add WASM RELAXED-SIMD F32 RMINMAX microkernels

[yolanda15]

Add the missing WASM Relaxed simd f32 rminmax microkernels and update the reduce config to point to it.

[dsharlet]

This change breaks the wasmdimd build here because when XNN_ARCH_WASMRELAXEDSIMD is enabled, this kernel is not declared:

XNNPACK/src/configs/reduce-config.c

Lines 1043 to 1044 in a4673cf

	#elif XNN_ARCH_WASMSIMD || XNN_ARCH_WASMRELAXEDSIMD
	f32_rminmax_config.ukernel = XNN_INIT_REDUCE_UKERNEL(xnn_f32_rminmax_ukernel__wasmsimd_minmax_u16_acc4);

[yolanda15]

Thanks for the comment! Do you think I should update reduce-config in this PR, or create a seperate PR to update it?

[dsharlet]

I think it depends on what you update it to. If you want the relaxed simd config to use these new kernels, I would just update it in this PR.

[yolanda15]

Got it. Thanks! I have uploaded the new change. Please note that it rebases with the latest change on wasm simd template from #9970.