Fix hash collision in generated variable names

[devongovett]

Fixes #6708.

JsWord is derived from the string-cache crate. This implements the hash method, and in some cases uses a very poor hash function. This replaces that by writing the actual string bytes to the hasher instead.

[height]

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[parcel-benchmark]

Benchmark Results

Kitchen Sink ✅

Timings

Description	Time	Difference
Cold	2.37s	+39.00ms
Cached	345.00ms	-2.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

No bundle changes detected.

React HackerNews ✅

Timings

Description	Time	Difference
Cold	10.96s	-1.21s 🚀
Cached	500.00ms	-71.00ms 🚀

Cold Bundles

Bundle	Size	Difference	Time	Difference
dist/index.js	487.00kb	+0.00b	5.94s	-481.00ms 🚀
dist/PermalinkedComment.e846300d.js	4.20kb	+0.00b	5.93s	-481.00ms 🚀
dist/UserProfile.a136423a.js	1.57kb	+0.00b	5.93s	-482.00ms 🚀
dist/NotFound.a7537975.js	429.00b	+0.00b	5.93s	-482.00ms 🚀
dist/logo.c5bb83f1.png	246.00b	+0.00b	5.89s	-498.00ms 🚀

Cached Bundles

Bundle	Size	Difference	Time	Difference
dist/index.js	487.00kb	+0.00b	5.80s	-463.00ms 🚀
dist/PermalinkedComment.e846300d.js	4.20kb	+0.00b	5.80s	-464.00ms 🚀
dist/UserProfile.a136423a.js	1.57kb	+0.00b	5.80s	-464.00ms 🚀
dist/NotFound.a7537975.js	429.00b	+0.00b	5.80s	-463.00ms 🚀
dist/logo.c5bb83f1.png	246.00b	+0.00b	5.75s	-461.00ms 🚀

AtlasKit Editor ✅

Timings

Description	Time	Difference
Cold	1.21m	+53.00ms
Cached	1.91s	+81.00ms

Cold Bundles

Bundle	Size	Difference	Time	Difference
dist/index.6e27519f.js	1.78mb	-1.00b 🚀	21.24s	+770.00ms
dist/index.543acb98.js	694.70kb	+15.00b ⚠️	55.66s	+340.00ms

Cached Bundles

Bundle	Size	Difference	Time	Difference
dist/index.a86a72f2.js	1.78mb	+6.00b ⚠️	20.65s	-409.00ms
dist/index.5afe9f27.js	694.70kb	+19.00b ⚠️	54.29s	-1.53s

Three.js ✅

Timings

Description	Time	Difference
Cold	8.06s	-123.00ms
Cached	457.00ms	+2.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

No bundle changes detected.

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