Improve lookup tables for string escaping. #700

Job	Run time
Ruby memcheck	56s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	54s
ubuntu-22.04 3.0	33s
ubuntu-22.04 3.1	34s
ubuntu-22.04 3.2	29s
ubuntu-22.04 3.3	32s
ubuntu-22.04 3.4	30s
ubuntu-22.04 head	1m 22s
ubuntu-22.04 jruby	1m 10s
ubuntu-22.04 jruby-head	1m 5s
macos-13 2.7	1m 44s
macos-13 3.0	44s
macos-13 3.1	39s
macos-13 3.2	32s
macos-13 3.3	37s
macos-13 3.4	48s
macos-13 head	36s
macos-13 jruby	1m 51s
macos-13 jruby-head	1m 15s
macos-14 2.7	49s
macos-14 3.0	20s
macos-14 3.1	31s
macos-14 3.2	19s
macos-14 3.3	19s
macos-14 3.4	23s
macos-14 head	19s
macos-14 jruby	43s
macos-14 jruby-head	38s
windows-latest 2.7	3m 25s
windows-latest 3.0	3m 27s
windows-latest 3.1	2m 4s
windows-latest 3.2	1m 58s
windows-latest 3.3	2m 25s
windows-latest 3.4	2m 37s
windows-latest head	2m 22s
windows-latest mswin	1m 14s
ubuntu-latest jruby-9.4	1m 10s
macos-latest truffleruby-head	39s
ubuntu-latest truffleruby-head	2m 7s
	44m 42s

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