Add custom event name interning to yajl2_c #182

Job	Run time
Build ijson and run unit tests (ubuntu-latest, 3.8)	22s
Build ijson and run unit tests (ubuntu-latest, 3.9)	19s
Build ijson and run unit tests (ubuntu-latest, 3.10)	18s
Build ijson and run unit tests (ubuntu-latest, 3.11)	26s
Build ijson and run unit tests (ubuntu-latest, 3.12)	19s
Build ijson and run unit tests (ubuntu-latest, 3.13)	24s
Build ijson and run unit tests (windows-2019, 3.8)	1m 12s
Build ijson and run unit tests (windows-2019, 3.9)	1m 10s
Build ijson and run unit tests (windows-2019, 3.10)	1m 3s
Build ijson and run unit tests (windows-2019, 3.11)	44s
Build ijson and run unit tests (windows-2019, 3.12)	1m 0s
Build ijson and run unit tests (windows-2019, 3.13)	2m 0s
Build ijson and run unit tests (macos-14, 3.8)	54s
Build ijson and run unit tests (macos-14, 3.9)	1m 6s
Build ijson and run unit tests (macos-14, 3.10)	33s
Build ijson and run unit tests (macos-14, 3.11)	16s
Build ijson and run unit tests (macos-14, 3.12)	19s
Build ijson and run unit tests (macos-14, 3.13)	15s
Build ijson and run unit tests (ubuntu-latest, pypy3.10)	30s
	13m 10s

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