refactor: minor improve and remove unused traits impls for f32/f64

[yjhmelody]

And do code fmt for traits impl orders.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.27ms	1.30ms	🔴 1.88%	1.12ms	1.09ms	🟢 -3.00%	🟢 -16%
execute/ bare_call_0/typed	710.72µs	749.99µs	🔴 6.28%	541.65µs	540.81µs	⚪ -0.24%	🟢 -28%
execute/ bare_call_1	1.39ms	1.42ms	🔴 2.58%	1.35ms	1.35ms	🟢 -0.10%	🟢 -5%
execute/ bare_call_16	2.97ms	3.00ms	⚪ 1.80%	5.00ms	5.00ms	🟢 0.09%	🟡 67%
execute/ bare_call_16/typed	1.29ms	1.30ms	⚪ 0.97%	2.31ms	2.28ms	🟢 -1.76%	🟡 75%
execute/ bare_call_1/typed	800.88µs	852.73µs	🔴 6.55%	869.94µs	864.92µs	⚪ -0.81%	🟢 1%
execute/ bare_call_4	1.78ms	1.80ms	⚪ 2.12%	2.16ms	2.16ms	🟢 0.12%	🟢 20%
execute/ bare_call_4/typed	893.27µs	887.96µs	⚪ -0.65%	998.64µs	982.08µs	🟢 -1.69%	🟢 11%
execute/ br_table	938.17µs	952.10µs	🔴 1.41%	1.10ms	1.09ms	⚪ -0.21%	🟢 15%
execute/ count_until	1.20ms	903.17µs	🟢 -24.64%	2.21ms	2.21ms	⚪ -0.03%	🔴 144%
execute/ factorial_iterative	365.05µs	364.89µs	⚪ 0.00%	903.19µs	902.98µs	⚪ -0.09%	🔴 147%
execute/ factorial_recursive	711.40µs	710.85µs	⚪ -0.08%	1.44ms	1.44ms	⚪ -0.02%	🔴 103%
execute/ fib_iterative	1.79ms	1.79ms	⚪ -0.02%	4.91ms	4.91ms	⚪ -0.23%	🔴 174%
execute/ fib_recursive	6.75ms	6.76ms	⚪ 0.15%	13.52ms	13.58ms	⚪ 0.38%	🔴 101%
execute/ global_bump	1.38ms	1.38ms	⚪ 0.13%	3.36ms	3.35ms	⚪ -0.28%	🔴 143%
execute/ global_const	999.52µs	1.00ms	⚪ 0.10%	2.51ms	2.52ms	⚪ 0.16%	🔴 151%
execute/ host_calls	32.38µs	32.38µs	⚪ 0.02%	44.69µs	44.74µs	⚪ 0.10%	🟢 38%
execute/ memory_fill	1.55ms	1.55ms	⚪ 0.05%	4.08ms	4.07ms	⚪ -0.26%	🔴 162%
execute/ memory_sum	1.55ms	1.55ms	⚪ -0.03%	4.06ms	4.05ms	⚪ -0.08%	🔴 161%
execute/ memory_vec_add	3.06ms	4.89ms	🔴 59.70%	8.13ms	8.03ms	⚪ -1.01%	🟡 64%
execute/ recursive_is_even	1.30ms	1.29ms	⚪ -0.82%	2.57ms	2.49ms	🟢 -3.23%	🟡 93%
execute/ recursive_ok	166.97µs	167.24µs	⚪ 0.08%	343.74µs	345.02µs	⚪ 0.17%	🔴 106%
execute/ recursive_scan	209.01µs	213.20µs	🔴 2.03%	439.92µs	438.20µs	⚪ -0.48%	🔴 106%
execute/ recursive_trap	16.42µs	16.25µs	⚪ -1.29%	34.30µs	33.93µs	⚪ -1.15%	🔴 109%
execute/ regex_redux	678.60µs	664.76µs	🟢 -2.03%	1.45ms	1.45ms	⚪ -0.13%	🔴 118%
execute/ rev_complement	583.99µs	583.93µs	⚪ 0.01%	1.43ms	1.43ms	⚪ -0.04%	🔴 146%
execute/ tiny_keccak	462.06µs	475.46µs	🔴 2.96%	1.29ms	1.32ms	🔴 2.64%	🔴 178%
execute/ trunc_f2i	1.01ms	1.02ms	🔴 1.46%	2.45ms	2.44ms	⚪ -0.28%	🔴 138%
instantiate/ wasm_kernel	72.09µs	71.16µs	⚪ 0.25%	94.88µs	94.64µs	⚪ -0.28%	🟢 33%
translate/ wasm_kernel	4.18ms	4.17ms	⚪ -0.10%	8.03ms	7.79ms	🟢 -3.46%	🟡 87%

Link to pipeline

[Robbepop]

LGTM Thanks for the follow-up.