[]byte与ASCII值加减实现63.6%性能加速以及83%内存消耗下降，基准测试如下：

$ /usr/local/sbin/go test -benchmem -run=^$ -bench "^(BenchmarkGenAesKeyWithMap|BenchmarkGenAesKeyWitthSlice)$" . -v
goos: linux
goarch: amd64
pkg: github.com/idle-ape/byte_ascii_op_benchmark
cpu: Intel(R) Celeron(R) J4025 CPU @ 2.00GHz
BenchmarkGenAesKeyWithMap
BenchmarkGenAesKeyWithMap-2               225337              5071 ns/op             958 B/op         27 allocs/op
BenchmarkGenAesKeyWitthSlice
BenchmarkGenAesKeyWitthSlice-2            600284              1846 ns/op             160 B/op          7 allocs/op
PASS
ok      github.com/idle-ape/byte_ascii_op_benchmark     2.339s

$ /usr/local/sbin/go test -benchmem -run=^$ -bench "^(BenchmarkGenAesKeyWithMap|BenchmarkGenAesKeyWitthSlice)$" . -v
goos: linux
goarch: amd64
pkg: github.com/idle-ape/byte_ascii_op_benchmark
cpu: Intel(R) Celeron(R) J4025 CPU @ 2.00GHz
BenchmarkGenAesKeyWithMap
BenchmarkGenAesKeyWithMap-2               220682              5062 ns/op             958 B/op         27 allocs/op
BenchmarkGenAesKeyWitthSlice
BenchmarkGenAesKeyWitthSlice-2            608526              1860 ns/op             160 B/op          7 allocs/op
PASS
ok      github.com/idle-ape/byte_ascii_op_benchmark     2.331s

性能测试结果解释

指标	GenAesKeyWithMap (基准)	GenAesKeyWithSlice	比较结果
执行耗时	5071 ns/op	1846 ns/op	⬇63.6% (快2.745倍)
内存分配量	958 B/op	160 B/op	⬇83.3%
分配次数	27 allocs/op	7 allocs/op	⬇74.07%
吞吐量	225,337 次/秒	600,284 次/秒	⬆166.39%