Refactor JSON::Ext::Parser to split configuration and parsing state #711

Job	Run time
Ruby memcheck	1m 1s
ruby-versions / Generate Ruby versions	4s
ubuntu-22.04 2.7	1m 0s
ubuntu-22.04 3.0	33s
ubuntu-22.04 3.1	46s
ubuntu-22.04 3.2	55s
ubuntu-22.04 3.3	29s
ubuntu-22.04 3.4	32s
ubuntu-22.04 head	1m 35s
ubuntu-22.04 jruby	1m 10s
ubuntu-22.04 jruby-head	1m 11s
macos-13 2.7	1m 59s
macos-13 3.0	34s
macos-13 3.1	48s
macos-13 3.2	32s
macos-13 3.3	49s
macos-13 3.4	38s
macos-13 head	32s
macos-13 jruby	1m 18s
macos-13 jruby-head	1m 12s
macos-14 2.7	55s
macos-14 3.0	28s
macos-14 3.1	23s
macos-14 3.2	25s
macos-14 3.3	33s
macos-14 3.4	34s
macos-14 head	25s
macos-14 jruby	56s
macos-14 jruby-head	48s
windows-latest 2.7	4m 32s
windows-latest 3.0	2m 40s
windows-latest 3.1	2m 33s
windows-latest 3.2	2m 20s
windows-latest 3.3	4m 20s
windows-latest 3.4	3m 43s
windows-latest head	1m 22s
windows-latest mswin	2m 18s
ubuntu-latest jruby-9.4	1m 13s
macos-latest truffleruby-head	41s
ubuntu-latest truffleruby-head	2m 7s
	50m 54s

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