Add custom event name interning to yajl2_c #183

Job	Run time
Build ijson and run unit tests (ubuntu-latest, 3.8)	36s
Build ijson and run unit tests (ubuntu-latest, 3.9)	21s
Build ijson and run unit tests (ubuntu-latest, 3.10)	19s
Build ijson and run unit tests (ubuntu-latest, 3.11)	18s
Build ijson and run unit tests (ubuntu-latest, 3.12)	20s
Build ijson and run unit tests (ubuntu-latest, 3.13)	25s
Build ijson and run unit tests (windows-2019, 3.8)	1m 17s
Build ijson and run unit tests (windows-2019, 3.9)	1m 16s
Build ijson and run unit tests (windows-2019, 3.10)	1m 21s
Build ijson and run unit tests (windows-2019, 3.11)	1m 20s
Build ijson and run unit tests (windows-2019, 3.12)	1m 26s
Build ijson and run unit tests (windows-2019, 3.13)	1m 45s
Build ijson and run unit tests (macos-14, 3.8)	54s
Build ijson and run unit tests (macos-14, 3.9)	34s
Build ijson and run unit tests (macos-14, 3.10)	46s
Build ijson and run unit tests (macos-14, 3.11)	16s
Build ijson and run unit tests (macos-14, 3.12)	17s
Build ijson and run unit tests (macos-14, 3.13)	16s
Build ijson and run unit tests (ubuntu-latest, pypy3.10)	36s
	14m 23s

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