Improve lookup tables for string escaping. #701

Job	Run time
Ruby memcheck	57s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	56s
ubuntu-22.04 3.0	33s
ubuntu-22.04 3.1	32s
ubuntu-22.04 3.2	1m 15s
ubuntu-22.04 3.3	31s
ubuntu-22.04 3.4	31s
ubuntu-22.04 head	1m 22s
ubuntu-22.04 jruby	1m 5s
ubuntu-22.04 jruby-head	1m 4s
macos-13 2.7	1m 44s
macos-13 3.0	48s
macos-13 3.1	36s
macos-13 3.2	32s
macos-13 3.3	49s
macos-13 3.4	1m 9s
macos-13 head	36s
macos-13 jruby	1m 59s
macos-13 jruby-head	1m 9s
macos-14 2.7	48s
macos-14 3.0	19s
macos-14 3.1	23s
macos-14 3.2	18s
macos-14 3.3	20s
macos-14 3.4	22s
macos-14 head	18s
macos-14 jruby	41s
macos-14 jruby-head	41s
windows-latest 2.7	3m 35s
windows-latest 3.0	1m 59s
windows-latest 3.1	2m 27s
windows-latest 3.2	2m 12s
windows-latest 3.3	2m 52s
windows-latest 3.4	4m 25s
windows-latest head	2m 34s
windows-latest mswin	2m 20s
ubuntu-latest jruby-9.4	1m 15s
macos-latest truffleruby-head	34s
ubuntu-latest truffleruby-head	2m 0s
	48m 34s

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