Introducing QuickJS engine as alternative JS engine.

[QuickJS](https://github.com/bellard/quickjs) will be added as an alternative JS engine. The goal is to achieve a drop-in replacement level support for QuickJS.
QuickJS is supported and developed by a wider community, it has almost full ES spec coverage.

QuickJS will be added in stages:

- [X] shell: https://github.com/nginx/njs/commit/b5a05767bd1da1a2bbcdbb144dd4b4e3c3ff43ef,  [0.8.5](https://nginx.org/en/docs/njs/changes.html#njs0.8.5)
- [X] nginx modules: https://github.com/nginx/njs/commit/201b127679e27fe63eff5c1b4356ec4ed9ec4611, [0.8.6](https://nginx.org/en/docs/njs/changes.html#njs0.8.6) 
- [X]  [sharedDict](https://nginx.org/en/docs/njs/reference.html#ngx_shared): https://github.com/nginx/njs/commit/352c2e594e57d2bce11f7e2a773dcab417182ef1,  [0.8.8](https://nginx.org/en/docs/njs/changes.html#njs0.8.8)
- [X] [ngx.fetch](https://nginx.org/en/docs/njs/reference.html#ngx_fetch): https://github.com/nginx/njs/commit/b7f76b71f4a1511cd9d954e6da3b0da4c9de40fb, [0.9.1](https://nginx.org/en/docs/njs/changes.html#njs0.9.1)

core modules:
- [X] [zlib](https://nginx.org/en/docs/njs/reference.html#zlib) module: https://github.com/nginx/njs/commit/bb3dcf21318391417ec43bde7195a768329c1240, [0.8.5](https://nginx.org/en/docs/njs/changes.html#njs0.8.5)
- [X] [crypto](https://nginx.org/en/docs/njs/reference.html#crypto) module: https://github.com/nginx/njs/commit/d5359d17f151bf172697e2ac353377b469b64c0f, [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)
- [X] [WebCrypto](https://nginx.org/en/docs/njs/reference.html#builtin_crypto) module: https://github.com/nginx/njs/commit/75ca26f8347123c3163439a3652c1218bcb3bfa7,  [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)
- [X] [fs](https://nginx.org/en/docs/njs/reference.html#njs_api_fs) module: https://github.com/nginx/njs/commit/1f8f9992d03e2865f354da3415f8a49931cf2fe8, [0.8.9](https://nginx.org/en/docs/njs/changes.html#njs0.8.9)
- [X] [buffer](https://nginx.org/en/docs/njs/reference.html#buffer) module: https://github.com/nginx/njs/commit/d1c615eaa208a4e7c92b661f8f7674e92f19aedf, [0.8.6](https://nginx.org/en/docs/njs/changes.html#njs0.8.6)
- [X] [querystring](https://nginx.org/en/docs/njs/reference.html#querystring) module: https://github.com/nginx/njs/commit/f289dcb99a9e4c9b72ca8d1c60659a43e58547cd, [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)
- [X] [xml](https://nginx.org/en/docs/njs/reference.html#xml) module: https://github.com/nginx/njs/commit/cec9a1650a5a46bbede4a0b7abd750d25df19f28, [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)

- [X] [process](https://nginx.org/en/docs/njs/reference.html#process) object: https://github.com/nginx/njs/commit/98fff325573c3554203e7cbc467066f7c8a45c2c, [0.8.8](https://nginx.org/en/docs/njs/changes.html#njs0.8.8)
- [X] [TextDecoder](https://nginx.org/en/docs/njs/reference.html#textdecoder): https://github.com/nginx/njs/commit/447d66d41d41504db976e900d94e75a90d388265, [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)
- [X] [TextEncoder](https://nginx.org/en/docs/njs/reference.html#textencoder): https://github.com/nginx/njs/commit/447d66d41d41504db976e900d94e75a90d388265, [0.8.10](https://nginx.org/en/docs/njs/changes.html#njs0.8.10)

**The following items will not be ported:**
njs-specific API: [njs.dump()](https://nginx.org/en/docs/njs/reference.html#njs_dump), [njs.on()](https://nginx.org/en/docs/njs/reference.html#njs_on), console.dump().
js_preload_object directive for [http](https://nginx.org/en/docs/http/ngx_http_js_module.html#js_preload_object) and [stream](https://nginx.org/en/docs/stream/ngx_stream_js_module.html#js_preload_object).
outdate modules loading: require().
 
NJS engine will stay a default JS engine for a while for backward compatibility (at least until QuickJS version is mature enough).

Feel free to ask questions and share you feedback.


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Introducing QuickJS engine as alternative JS engine. #698

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Introducing QuickJS engine as alternative JS engine. #698

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