add new config hashagg_use_magic_hash for tiflash

[guo-shaoge]

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[hfxsd]

Suggested change

	## 从 v9.1.0 引入，如果该配置为 true，TiFlash 的 HashAgg 会使用 magic hash 而非默认的 CRC32。
	## 从 v9.0.0 引入，如果该配置为 true，TiFlash 的 HashAgg 会使用 magic hash 而非默认的 CRC32。

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[windtalker]

lgtm

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