optimize(bytesconv): add support for go1.20

[a631807682]

What type of PR is this?

optimize

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bytesconv 增加 go1.20 的支持

(Optional) More detail description for this PR(en: English/zh: Chinese).

en: go1.20 provides a truly safe(ish) APIs people can rely on, to ensure that subsequent go versions will not break b2s/s2b (no real world examples). refer to https://github.com/golang/go/issues/53003 https://github.com/valyala/fasthttp/pull/1481

zh(optional): 使用 go1.20 提供的可以依赖的 api 去保证后续 go 版本不会破坏b2s/s2b（没有真实场景，不急）。参考 https://github.com/golang/go/issues/53003 https://github.com/valyala/fasthttp/pull/1481

Which issue(s) this PR fixes:

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.78 :tada:

Comparison is base (c98aec7) 72.49% compared to head (13b7d8f) 74.28%.

:exclamation: Current head 13b7d8f differs from pull request most recent head 50966b8. Consider uploading reports for the commit 50966b8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #686      +/-   ##
===========================================
+ Coverage    72.49%   74.28%   +1.78%     
===========================================
  Files           96      100       +4     
  Lines         9392     9396       +4     
===========================================
+ Hits          6809     6980     +171     
+ Misses        2154     1985     -169     
- Partials       429      431       +2     

Impacted Files	Coverage Δ
internal/bytesconv/bytesconv.go	89.71% <ø> (-1.04%)	:arrow_down:
internal/bytesconv/b2s_new.go	100.00% <100.00%> (ø)
internal/bytesconv/b2s_old.go	100.00% <100.00%> (ø)
internal/bytesconv/s2b_new.go	100.00% <100.00%> (ø)
internal/bytesconv/s2b_old.go	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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[welkeyever]

Is there any problem that related to current impl with Go1.20? For compatibility reasons, we currently may not change the minimum compatible version in go.mod🙏

[a631807682]

Is there any problem that related to current impl with Go1.20? For compatibility reasons, we currently may not change the minimum compatible version in go.mod🙏

unsafe.SliceData/unsafe.StringData supported by 1.20

internal/bytesconv/b2s_new.go:52:23: unsafe.SliceData requires go1.20 or later (-lang was set to go1.16; check go.mod)
internal/bytesconv/s2b_new.go:50:22: unsafe.StringData requires go1.20 or later (-lang was set to go1.16; check go.mod)