replace bare v8 string conversion call with wrapper functions #189

Job	Run time
urls	1s
Windows (https://github.com/puerts/backend-v8/releases/download/V8_8.4.371.19_230822/v8_bin_8.4.3...	5m 14s
Android (https://github.com/puerts/backend-v8/releases/download/V8_8.4.371.19_230822/v8_bin_8.4.3...	7m 42s
Windows (https://github.com/puerts/backend-quickjs/releases/download/QJS_231011/qjs_v8_bin.tgz, s...	4m 57s
Mac and IOS (https://github.com/puerts/backend-v8/releases/download/V8_8.4.371.19_230822/v8_bin_8...	15m 7s
Android (https://github.com/puerts/backend-quickjs/releases/download/QJS_231011/qjs_v8_bin.tgz, s...	9m 52s
Windows (https://github.com/puerts/backend-nodejs/releases/download/NodeJS_16.16.0_221228/nodejs_...	5m 19s
Mac and IOS (https://github.com/puerts/backend-quickjs/releases/download/QJS_231011/qjs_v8_bin.tg...	15m 24s
Android (https://github.com/puerts/backend-nodejs/releases/download/NodeJS_16.16.0_221228/nodejs_...	8m 10s
Mac and IOS (https://github.com/puerts/backend-nodejs/releases/download/NodeJS_16.16.0_221228/nod...	14m 42s
	1h 26m 28s

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